First of all, you should straighten out what we will take in the college entrance examination. What knowledge points must be mastered?
Then, I think you should have a round of review now, so the key is to sort out the most basic knowledge points. I think in your case, you should at least solve the doubts about the knowledge points first. If there are still uncertain questions about the knowledge points, go to the teacher's office and ask them clearly! Don't muddle along, whether it is the first round or the second round, it is most important to take basic knowledge as the core.
Then, after solving these problems, you should try to build your own knowledge network, which is a systematic examination center. When you sleep, you can think about what science you mainly talked about in high school for three years. Can you express it in trees and list it with your brain!
Also, don't throw away the exercises the teacher usually says. Be sure to ask clearly and write it down in your notebook. Moreover, the notebook is not for storage, but a tool to consolidate your problem-solving thinking. You should always watch it and summarize it while watching it.
And I personally suggest that you develop the habit of thinking independently. Whether you can digest what you just had in class actually depends on your own thinking process. Don't ask others as soon as you meet a question you can't answer. Be sure to ask others after your own thinking efforts.
Finally, when studying science, we must guard against arrogance and rashness, have an unashamed attitude and learn to be solid and step by step. Be sure to bite your teeth and stick to it!