Yup.. my son is like this. Frustrating isn't it. We had to back my son off on a full honors load of classes for my DS. As a junior he now takes honors/AP math/science and regular English/Social Studies. There are various reasons for this. I finally had him tested after a frustrating freshman year and DS has low working memory & processing speed. Seems that this makes the high homework load from a full honors very difficult to complete.

I hope you can figure out what's going on and what will help your son.