Thanks for understanding! I hate food rewards- that would really irritate me!

I have yet to understand the benefit of a problem in 3.1 seconds vs. 3.4 seconds. My DS will practice for hours, finish 90/100 and have all the answers right. But he needs 95/100 in 5 minutes to pass. It's becoming so embarrassing for him- he teaches his friends how to do long division, square roots and scientific notation but can't pass his divide by three test.