First of all, contestants need to be clear (especially senior one students). By the time of senior two and senior three, only a few players will be partially reserved, and most of them will withdraw from the competition for various reasons. This may vary from school to school. So if you choose physics, but you can't return next year, it's not worth the candle.

Besides, you mentioned that you have a good foundation in geometry, so you will have an advantage in the math contest. Furthermore, even if you can't go on, you can accumulate enough mathematical thinking, which is of great help to the college entrance examination.