The number 1 most important thing IMHO is to get a solid foundation in math. You do not need to jump ahead. A minimum would be to be ready to take calculus when you arrive at university. Marginally better would be to take calculus by your senior year of high school. However, what is important is to do very well in your math classes. You want to really understand what you are doing. Physics makes a lot of use of math, and you want to know math well. When you get to special relativity you will begin to understand what I mean.
My second suggestion is to get to AP physics C by your senior year of high school. Again I do not see much reason to jump ahead. More important is to do very well when you get to it.
Remember that life is not a race. You are young, you have plenty of time, and you really will be a stronger student in two years than you are now.