IAR Practice Tests 2026 June — Illinois Assessment of Readiness Guide

What Is the IAR?

The Illinois Assessment of Readiness (IAR) is the state-mandated standardized assessment for Illinois public school students in grades 3 through 8. Administered every spring, it measures student proficiency in English Language Arts (ELA) and Mathematics and is the cornerstone of Illinois's school accountability system under the federal Every Student Succeeds Act (ESSA).

The IAR is administered on computers in Illinois public schools, typically during a testing window that runs from March through April. Results are used by educators, parents, and state officials to gauge student progress, identify instructional gaps, and evaluate school performance across the state.

IAR vs. PARCC: What Changed?

The IAR replaced the PARCC assessment beginning in the 2018-19 school year. While Illinois had administered PARCC since 2014-15, the state transitioned to the IAR as a standalone assessment with Illinois-specific scoring benchmarks and a reduced testing footprint. Key differences include:

• Shorter testing time: IAR eliminated the speaking and listening components that were part of PARCC, reducing overall testing burden.
• Illinois-only scoring: IAR uses Illinois-specific cut scores and proficiency benchmarks rather than the consortium-wide standards used by PARCC.
• Same core content alignment: Both assessments are aligned to the same academic standards, meaning PARCC-style practice materials remain highly relevant for IAR preparation. Students can still benefit from a quality PARCC practice test when studying for the IAR.
• Same computer-based format: Both assessments are delivered digitally, with similar item types including multiple-choice, evidence-based selected response, and written response tasks.

Because the content framework is nearly identical, released PARCC items and practice tests are among the most effective preparation tools available for the IAR.

IAR Scoring and What the Levels Mean

The IAR uses a five-level performance scale. Levels 4 and 5 are considered proficient, reflecting grade-level mastery of Illinois academic standards:

• Level 1 — Did Not Yet Meet: The student demonstrates limited understanding of grade-level content. Significant instructional support is needed.
• Level 2 — Partially Met: The student shows partial understanding but has not yet reached grade-level expectations. Targeted intervention is recommended.
• Level 3 — Approached: The student is close to meeting grade-level expectations but falls just short of the proficiency threshold.
• Level 4 — Met: The student has demonstrated grade-level proficiency in ELA or Math. This is the standard proficiency benchmark.
• Level 5 — Exceeded: The student demonstrates advanced mastery beyond grade-level standards.

Illinois reports IAR proficiency rates publicly at the school, district, and state levels. These results feed directly into ESSA accountability metrics and influence decisions about additional school support and resource allocation.

How IAR Scores Are Used

IAR results serve multiple purposes in Illinois's education system. At the student level, scores help teachers identify which skills require additional instruction and which students may need enrichment or remediation. At the school level, proficiency rates are a key component of the Illinois Report Card, which parents and community members use to evaluate school performance.

At the state level, IAR data is submitted to the federal government as part of Illinois's ESSA plan and is used to identify schools that are not meeting performance targets. These schools may be designated for Comprehensive Support and Improvement (CSI) or Targeted Support and Improvement (TSI) status, which comes with additional monitoring and required improvement planning.

For students transitioning from elementary to middle school or approaching high school, IAR scores can also inform course placement decisions, particularly in mathematics, where performance may influence whether a student is placed in accelerated coursework.

Students in other states with similar assessments — such as the NJSLA practice test used in New Jersey — face comparable computer-based state assessments aligned to college-and-career-ready standards, making cross-state practice materials a useful supplemental resource.