After listening to your description, I feel that you are not a poor student. According to your current situation, I have the following suggestions:

1. Grade three math, I can't see the answer at a glance. Almost every question takes more or less time. Don't worry, because not only you, but everyone will spend some time when doing the problem.

As a good student, it is not enough to do only the basic questions. The topics in the supporting exercises can consolidate and improve the knowledge you have learned. Mathematics requires not only mastering concepts, but also drawing inferences from others. When you find the topic difficult, you can encourage yourself and give yourself full confidence.

Don't be afraid of problems, think calmly, answer questions calmly, and don't get upset. I believe you will overcome these problems.

I wish you overcome your academic difficulties and get into an ideal high school.