Classes stop counting after 5-10 years because new information is discovered constantly.

You can go to a uni and find out what the courses and requirements are for the majors you're interested in. Get in contact with the transfer office at the university and they will help you streamline to uni courses. Its also a good way to meet and make friends. Its also a good idea to talk to the disability office to see if they can help you out in any way. (Example; manic ->get extra time for assignment)

Taking advantage of the programs at the school will make it easier for you to adjust. Good luck!