Your SAT prep is really comprehensive, but I think that something should be done to boost the topics that you aren't as strong in. Say you aren't really very good at statistics. Because the SAT prep doesn't recommend anything, you're still stuck on that same topic. If the SAT prep had the ability to give recommended Khan videos that cover topics you struggle in, that would be great. Then people would be able to cover most of the material they need to know for SAT.