The Advanced Placement program is one of the most popular and accessible ways for high school students to get college credit. But you can’t just show up to class, do the homework, and expect to automatically get college credit.

Besides AP and other college-level classes you can take in high school, there are also state-sponsored programs that allow high school students to take actual college classes and “double dip” by getting high school credit for the college classes they take.

Wait, what? College courses taught by your high school teachers? Yes, it’s a thing.