1. You can draw the key points with a pencil when reviewing the questions, which will help you concentrate on the questions. That's how I do my problems, and there are very few cases where I read them wrong.

To complicate the problem is actually your unfamiliarity with this kind of problem. You should do more topics that will have such problems. Do a few more questions and it won't be like this.

For the fourth point, in fact, your induction level is insufficient. We should do more topics similar to the central idea of induction.

Actually, 780 is 70 points short of 850. If you want to improve 70 points in just ten days, you must focus on science. The state during the exam is also very important. Pay attention to rest in the next few days. When we are in good condition, we can reduce unnecessary mistakes in answering questions. I think you lost at least 30 points in the exam.

Work hard and believe you can do it!