Anybody else find it difficult to study long after coming home from school?

Unlike a good few others, I'm trying my best to stay in school throughout the next few weeks as I feel like I'm not going to be as productive at home (teachers are a great help for difficult q's too).

The problem is: I find myself feeling wrecked at the end of the school day and can only do homework/study for around an hour before losing all focus and motivation...

Has anyone else been having this problem? And are there any useful methods to help? Maybe staying home and focusing on the more difficult subjects instead is the best way moving forward.