If I may jump in here with questions about the SCAT...

Is it knowledge-based or mainly a test of aptititude? I am considering having my DS6 (2nd grade) take it but don't want it to be low just because he wasn't exposed to math facts. He is PG with a strength in math but hasn't had formal instruction beyond grade level. If it relies on factual knowledge, is there any material I could have him briefly review so that it captures his aptitude?