Read lots of books. When you think you can read at a higher grade level, start reading harder books. After all the reading, you should have learned something. Use the Internet. The Internet has a lot of useful websites, and some not very useful ones to. Use only the reliable websites to learn as much as you can. Self-directed learning is one solution to the college debate.
All education is self-education. Period. It doesn’t matter if you’re sitting in a college classroom or a coffee shop. We don’t learn anything we don’t want to learn. Can you educate yourself? Of course you can. It requires a willingness to learn, the self discipline to stay focused and do what you have to do.