Answer:
1. Do past papers
2. spend your time looking threw questions and understanding them
3. Look at past tests you done before and look into the questions you do not understand
4.ask your teachers to give you some time to help
5. flash cards really help with memorizing!
6. Ask your teacher for work sheets and ask what things you need to revise on, for future tests.
7. if so, you can ask friends to help you
8. go and videos on the topics you don't understand (it really helps)
9. Writing notes are quite helpful
But make sure you uderstand what your write then just copying it down
10. Don't revise for so many hours for all the subjects. Just take your time and understanding is important.