The reasons are as follows
1. Your main worry is that you will be too tired and afraid of not getting any results. You gave physics and math grades, but you didn't get chemistry grades, but I think chemistry grades should be good. Although your overall score is good, it should be worse than your science score. Should be Chinese or English can be improved more. In the third grade, the main task is to sprint the senior high school entrance examination and have a science competition. I don't think it will greatly improve your scores in the senior high school entrance examination, but it will take up more liberal arts study time.
Only need to study 17 days. I don't think 17 days will change your grades much. If you are interested, you can usually pay more attention to one subject. I had this problem when I was in junior high school, and I also had an extra computer. I chose to attend all of them at that time, but after all, I was too distracted to get any results.
I think it's risky to do it if your grades help you in the middle school entrance examination. Because after all, you didn't start training at an early age, your interest may not be great, and people who really love you will not be confused, so I think if you start from reality, the future is of little significance.
Actually, it depends on you. If your English is also good in a given situation, maybe I will agree to your participation. Since you didn't give it, I don't think your English is very good. I suggest spending more time on it. To put it simply, I think you are a good student and work hard. But maybe your talent in this field is not enough, otherwise you may have found your interest in these competitions long ago.
If there is pressure from parents, teachers' suggestions and other people's opinions, I think you will have your own judgment after listening. Don't be too entangled. In fact, this in itself cannot change your future. Your future is uncertain, but it must be in your own hands.
Remember: choose what you like and like what you choose.
I hope it helps you.