In addition to academic and extracurricular preparation for college, you should figure out what accommodations work for you academically. This will give you a starting point to ask for accommodations in college.
High school is also the best time to practice asking for the accommodations you need so you have the confidence and skills to do this yourself in college. You should work with your parents, teachers, and others to become more involved in your IEP or Section 504 plan if you have one. If you don’t, you should work with your parents, teachers, and counselor to develop a plan to ensure you’re on track for college.