Teaching yourself a subject is so much faster than going to school for it.

Alright so I’m a highschooler and I am currently studying for AP economics. I did a practice test and got 40% so I decided to learn everything. I spent about 6 hours each day of my summer studying and by the end of the month I got 80% on the practice test. I’m very proud of how much I learned in such a short amount of time. This makes me wonder if college would be worth it for me personally, maybe I can teach myself whatever I want to learn?