Require all schools to start at 10:00, and end at 4:30, because the brain is not fully active until 10.

It has been scientifically proven that the brain is not fully active until 10 am. When schools start at 8 or 9, we cannot fully take advantage of everything learned in the time when our brains are not fully active. Starting school at 10 would increase everyone's learning capabilities, and would also result in better grades across the board.

Sources:

http://www.dailymail.co.uk/news/article-428233/Making-teens-start-school...