The TerraNova is a standardized achievement test used in grades K–12 to assess student mastery in core academic subjects. It was originally developed by CTB/McGraw-Hill and is now published by Data Recognition Corporation (DRC). Unlike state-specific tests, the TerraNova is a nationally norm-referenced test — meaning student scores are compared against a national sample rather than state-specific standards. This makes TerraNova results useful for understanding how a student performs relative to their grade-level peers across the country.
The TerraNova is widely used in private schools, Catholic schools, and by homeschool families who need an objective, standardized way to measure academic progress. Some public school districts have also used the TerraNova, though public school testing is increasingly driven by state assessments tied to specific grade-level standards. The test is available in several configurations — full-length survey and targeted subject tests — so schools can choose the depth of assessment that fits their needs. Because it's norm-referenced, the TerraNova doesn't have a single pass/fail score; instead, it produces comparative data showing where a student ranks nationally.
The TerraNova has gone through three major editions: the original TerraNova, TerraNova 2 (CAT/6), and the current TerraNova 3. Each edition was updated to reflect new curriculum expectations and renormed against a fresh national sample. The TerraNova 3 is the version currently in use. Some families also refer to TerraNova-based tests by other names, including the Comprehensive Tests of Basic Skills (CTBS) and the California Achievement Test (CAT), which share the same publisher history. If you're preparing for an upcoming test, a terranova practice test can help familiarize students with the format and question style.
One important distinction about the TerraNova is that it tests broad academic achievement rather than mastery of specific state or common core standards. This means a student can score well on the TerraNova even if their school uses a non-standard curriculum, and it also means that TerraNova scores may not perfectly predict performance on a state standards-based test.
The two types of assessments serve complementary purposes: norm-referenced tests like the TerraNova tell you where a student stands nationally; criterion-referenced state tests tell you whether a student has mastered specific learning standards. Both provide valuable information for a complete picture of student achievement.
TerraNova results are used by schools and families for a variety of purposes beyond simply tracking academic progress. Private schools sometimes use TerraNova scores for admissions decisions or placement into accelerated programs. Some scholarship programs consider national percentile ranks when awarding merit-based financial assistance.
Homeschool families use TerraNova results to satisfy state annual testing requirements and to evaluate whether their curriculum is achieving the intended academic outcomes. In each of these use cases, the national comparative nature of the test is what makes the scores meaningful — a 75th percentile score in reading carries the same meaning whether the student attends a school in Texas, New York, or is homeschooled in rural Montana.
The TerraNova tests five core academic subject areas across grade levels K through 12. Not every school administers all five subject areas — schools often select the subjects that align with their curriculum review priorities. The five subject areas are Reading/Language Arts, Mathematics, Science, Social Studies, and Word Analysis (for early grades). Each subject is tested using multiple-choice questions, with some editions including constructed-response items for Language Arts.
Schools that want a quick assessment of core literacy and numeracy often administer only Reading, Language, and Mathematics, which keeps testing time under two days and still provides the most instructionally useful data. Science and Social Studies add testing time but provide broader curriculum coverage data that can be valuable for schools doing comprehensive academic audits or reviewing their curriculum alignment across subject areas.
Reading and Language Arts are the most heavily weighted subjects. The Reading section tests comprehension, vocabulary in context, making inferences, and identifying main ideas and supporting details. The Language Arts section tests grammar, sentence structure, writing conventions, and composition skills. In the lower grades (K–2), the test uses simpler item formats and focuses on foundational literacy skills like phonics, letter recognition, and basic reading comprehension. By middle and high school grades, the reading passages become significantly more complex and the vocabulary demands increase substantially.
Mathematics on the TerraNova tests number concepts, operations and computation, measurement, geometry, data analysis and statistics, and problem solving. The specific content tested aligns with broadly accepted national math standards and is appropriate for each grade level. Science content covers life science, earth science, and physical science. Social Studies covers geography, history, economics, and civics concepts. These two subjects are optional in many testing programs — some schools only administer Reading, Language, and Mathematics sections to keep testing time manageable.
TerraNova offers testing in Spanish (TerraNova SUPERA) for schools serving Spanish-dominant students. The SUPERA assesses the same subject areas as the standard TerraNova but in Spanish, providing a normed comparison for Spanish-speaking students. This is particularly relevant for bilingual programs and schools with large ELL student populations who need achievement data in the student's dominant language.
SUPERA scores are reported on the same scale as the English version, allowing direct comparison of student progress regardless of the language in which the assessment was administered. Schools can track ELL students' academic growth over time even as their English proficiency develops separately from their content knowledge.
TerraNova scores are reported in several different formats, each of which communicates something different about a student's performance. Understanding what each score type means is important for interpreting a TerraNova score report. The most frequently reported scores are the Scale Score, National Percentile Rank (NPR), Normal Curve Equivalent (NCE), Stanine, and Grade Equivalent. A student's TerraNova score report will typically include all five score types for each subject tested, which can seem overwhelming at first but provides a comprehensive view of where the student stands.
The Scale Score is a continuous number that represents a student's level of achievement on the subject area. Scale scores are used to track longitudinal growth — comparing a student's score from one year to the next shows how much they've progressed. The scale is consistent across grade levels, so a student who scored 640 in 4th grade math and 680 in 5th grade math has measurably improved even though the tests cover different content.
The National Percentile Rank (NPR) is the most commonly discussed TerraNova score. It shows what percentage of the national norm group the student scored at or above. An NPR of 72 means the student scored as well as or better than 72% of students in the same grade nationally. NPRs range from 1 to 99; a score of 50 represents the median — exactly average nationally.
NPRs are not evenly distributed in difficulty: moving from the 50th to the 60th percentile is easier than moving from the 85th to the 95th. Normal Curve Equivalents (NCEs) solve this problem by placing scores on an equal-interval scale from 1 to 99, making them more appropriate for statistical comparisons and program evaluation.
Stanines are whole-number scores from 1 to 9 that group students into broad performance bands: stanines 1–3 are below average, 4–6 are average, and 7–9 are above average. Grade Equivalents (GE) express results as a grade level — a 4th grader with a GE of 6.2 scored as well as a typical 6th grader in the 2nd month of the school year would on the same test content.
GEs are often misunderstood: a GE of 6.2 for a 4th grader doesn't mean the child is ready for 6th grade curriculum, only that they scored at a 6th grade level on 4th grade content.
What it means: The percentage of students in the national norm group who scored at or below this student's score.
Example: NPR of 68 means the student scored better than 68% of students nationally in that grade and subject.
Range: 1 to 99. Score of 50 = exactly average nationally.
Use: Best for explaining relative standing to parents and students. Easy to communicate — 'your child scored better than X% of students nationwide.'
What it means: An equal-interval score that places students on a scale of 1 to 99, with a mean of 50 and standard deviation of 21.06.
Key difference from NPR: NCE scores are on a truly equal interval scale — a 10-point NCE gain at any point on the scale represents the same amount of growth. NPR gains are not equal-interval.
Use: Best for statistical analyses, program evaluation, and comparing growth across groups. Used in federal program reporting (Title I) because of their statistical properties.
What it means: The grade and month at which the average student nationally achieved this scale score. A GE of 5.4 means the score matches what an average 5th grader in the 4th month of school typically scores.
Critical caution: A 3rd grader with a GE of 6.0 is not ready for 6th grade curriculum. It means they scored as a typical 6th grader would on 3rd grade content. GEs are easily misinterpreted.
Use: Useful for communicating that a student is above or below grade level, but should always be paired with NPR for context.
The TerraNova is administered in a paper-and-pencil format at most schools. Multiple-choice items make up the majority of the test, though TerraNova 3 includes some open-ended items in Language Arts that require short written responses. The total testing time varies by grade level and the number of subjects being assessed. For a full battery covering all five subject areas, testing typically spans two to three days to avoid fatigue.
Individual subject sections are timed separately. For middle school grades, a typical Reading section runs approximately 45–60 minutes; Mathematics runs 45–60 minutes; Science and Social Studies each run about 45 minutes. In early grades, sections are shorter to match younger students' attention spans and stamina. Teachers or test administrators read directions aloud for younger grades. TerraNova is not an adaptive test — all students in the same grade take the same version of the test.
Schools have flexibility in how they schedule TerraNova administration. Some administer it in the fall to establish a baseline for the school year; others administer in the spring to assess end-of-year achievement. Results are returned to schools by the publisher and include both individual student reports and class/grade-level summary reports. Schools can use the data for curriculum review, identifying students who need intervention or enrichment, and tracking progress over time. Getting familiar with the item style beforehand through a practice test pdf helps students approach the real test with confidence.
TerraNova answer sheets use a standard bubble format — students fill in circles corresponding to answer choices A, B, C, or D. For young students in grades K–2, the test format is adapted to be age-appropriate: items may use pictures rather than text, and the answer choices are presented as images. Teachers typically read all test directions aloud for younger students. For grades 3 and above, students read directions and items independently, which makes reading proficiency a prerequisite for accurate performance across all subject areas.
TerraNova does not penalize for wrong answers — the score is based purely on the number of correct responses. This means students should answer every question, even if uncertain. Leaving questions blank reduces the score unnecessarily. Teaching students this test-taking strategy before exam day is a simple way to maximize scores without any additional content preparation. The full-length test can feel demanding because of its multi-day format, so building test stamina through practice is one of the most effective preparation strategies.
TerraNova is one of the most widely used standardized tests among homeschool families. Many states that require homeschool students to take an annual standardized achievement test accept TerraNova results. The test can be ordered through homeschool testing services or accredited test administrators, and results are returned to the family rather than a school. Because results go directly to parents rather than a school administration, families retain full control over how the data is used and shared.
This makes TerraNova a practical option for families who want objective data on their child's academic progress without enrolling in a school that administers state assessments. States like Virginia, Pennsylvania, North Dakota, and others that require annual testing often specifically list TerraNova or another nationally norm-referenced test as an acceptable option for compliance. Always verify your specific state's current homeschool testing laws, as requirements change periodically.
Homeschool families typically order testing through third-party testing services that are approved to administer TerraNova. These services provide the test materials, administer or proctor the test, and return score reports. Some services allow parents to administer the test at home (parent-administered testing) while others require an approved proctor.
Families should verify their state's homeschool testing requirements to confirm whether parent-administered testing is accepted or whether a neutral proctor is required. The cost of TerraNova through homeschool testing services typically ranges from $25 to $75 per student depending on the number of subjects and the service provider — far less than private tutoring or commercial test prep services.
When selecting TerraNova as the annual assessment, homeschool parents should request the full battery if possible, as having scores in multiple subjects provides a more complete picture of academic progress. Score reports include individual student performance data broken down by content cluster — so within mathematics, you can see which specific strands (geometry, computation, data analysis) the student is strongest and weakest in. This cluster-level data is particularly valuable for homeschool curriculum planning: if a student scores in the 30th percentile in data analysis but the 80th percentile in computation, that's actionable information for the next school year.
The TerraNova score report is particularly useful for homeschoolers because it provides national comparison data. Unlike purely curriculum-based assessment (grading the student's own work), a TerraNova score shows how the student compares to a national norm group — a useful sanity check for whether the curriculum and instructional approach are working. A student consistently in the 50th–70th percentile range nationally is progressing typically relative to peers, while scores below the 25th percentile may suggest areas that need additional focus or a different instructional approach.
Many homeschool families use the TerraNova annually to track progress over multiple years. Because the scale scores are continuous and comparable across grade levels, parents can graph a child's scale score trajectory from year to year and see clear patterns — steady growth, acceleration in certain subjects, or plateaus that may indicate the need for curriculum change. This longitudinal data is one of the most valuable features of a norm-referenced test like the TerraNova compared to curriculum-based assessments alone.