Honestly, looking at the math, I'm not sure how he got as high as he did. I don't see how he knew all that stuff.
I feel the same way when I look at my daughters' scores. It helped when I looked at a report broken broken down into sub-sections (goals). It's reported as 3 different 10 point ranges (below, at, and above the RIT score):
1. Skills and Concepts to Enhance (73% probability students would correctly answer items measuring these concepts and skills)
2. Skills and Concepts to Develop (50% probability)
3. Skills and Concepts to Introduce (27% probability)
So basically it doesn't mean your son has mastered those concepts at his RIT level but those are things he's ready to work on developing. Does that help?
