This is an excellent question.
For accounting, I would be prepared for a career that challenging and unlike anything that you are learning currently in high school. Accounting is very different from most of the subjects that you will study in high school. Math is involved in accounting but most of the math for accounting is very basic.
Accounting is mostly rules based and there is a lot of logic and writing involved. I often joke that a career in accounting is a combination of tech support, investigating journalist, English major, phycologist, mathematician, and professional sports referee. There is a lot more involved than just math and the typical things you think about with accounting.
Going into college I would be prepared to learn a different skill set and a way of thinking than you have learned before. Your college classes will be very different than what you have learned before. Be prepared to be a little uncomfortable and be patent with the learning. It usually does not come easy at first and takes some time to learn what accounting really is and the concepts.