First of all, you can get up early in the morning, recite the contents of Chinese and history (it is recommended to recite one subject a day), and then do some related topics (you can consider May 3, there are special exercises, which can be done according to weak projects. And assemble the wrong questions into a notebook. In addition, you can read some extracurricular history books and master some other contents, which is of great help to your classroom and study. Tired of doing homework, you might as well read Reader's Youth Digest and so on, which will cultivate sentiment and have a subtle influence on composition and reading questions.
But don't leave your math, English and science behind. I suggest looking for an American TV show, writing down good sentences and words in a notebook, just watching if you have nothing to do and doing a perfect reading every day. If you want to do math science, you just need to preview the content of next semester and buy a thinner exercise book to do it.
This is my suggestion. I hope it works for you.
I wish you progress in your study ~!