He's actually worried he will guess right when he doesn't know the answer because we told him the test is supposed to show what he doesn't know. So he figures that if he guesses and gets it right that means he is somehow cheating and/or messing up the test and he hates cheating/messing things up.

I know that he is solidly at mid 4th grade for mastered curriculum and beyond that in some areas like geometry and calculus (because the school is giving him pull out calculus, not because I'm teaching that). I'd say he has some areas where he is easily at 6th grade level and he has a great interest in and understanding of theoretical math ideas.

I'm mostly just wondering if I should ask if he can skip these tests or move to a higher test, and whether they are actually showing anything useful. DS is slow at everything in life and he misses a lot of class time just to take a test that shows no/negative growth since summer and I'm kinda wondering what the point is. It's not like I don't have a good idea where he is at. The school obviously knows he is really far ahead or they wouldn't be giving him a math pull out from a gifted class to do calculus with the math specialist.

Based on what everyone has said so far I'm leaning towards asking the school to allow him to skip the math portion and just take the reading test. I'm assuming that test will show useful results vs this one for DS.