text: what should i be doing in highschool to become a physcian assistant?   you need to focus on your math and science. it's easier if you start out going for your rn, school takes less time and costs less money. then if you work as a rn for a few years your continued schooling is just a few years and you can earn a paycheck at the same time. and many employers will pay for you to continue your education so the continuing classes will be free.