Finally got my GXMO certification after putting it off for almost a year. Took 6 weeks to prepare, studying about 75 minutes a day after work. Passed with an 82%, which was better than I expected given how nervous I was about the radiation physics sections. Wanted to write up what worked in case it helps someone else in the same position I was.
The content breaks down roughly into equipment operation, radiation safety, patient positioning, and image quality. Radiation safety took about 30% of my study time because the questions get specific about dose limits and shielding requirements — numbers you need to have memorized, not just understood conceptually. Equipment troubleshooting questions were also harder than the study guide suggested they'd be.
I used three resources: the ARRT candidate handbook, a prep book with around 800 practice questions, and free YouTube videos for the physics concepts. The YouTube content was honestly the most helpful for filling gaps in my physics background, which was thin coming in. If your physics is shaky, don't skip that step.
Which prep book did you use? I've seen a few options and can't tell which has the best question quality. My exam is in about 7 weeks and I want to make sure I'm using the right materials.
The patient positioning content is more detailed than most people expect. There are specific projections and angulations you need to know by name, not just how X-ray positioning works generally. I made a table of all of them with the key angles and reviewed it every day.
82% is a solid score. The exam isn't brutal but it's not a gimme either — I know people with years of radiology experience who failed the first time because they underestimated how specific the technical knowledge questions get.
Congratulations. The radiation dose limits are something you need to memorize cold — I lost points on my first attempt because I was estimating instead of knowing the exact numbers. Drill those until they're automatic.