Found in 2 comments on Hacker News
papaf · 2010-05-10
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I came back to studying after a 12 year break where I hardly used maths. I bought the Students Survival Guide and found it very useful and easy to dip in to after work:
http://www.amazon.com/Maths-Students-Survival-Self-Help-Engi...
It takes you to the level needed by most Science/Engineering undergraduate courses.
Not everyone enjoys being an entrepreneur. If you feel like you're the kind of guy who needs stable employment, consider this: get your GED (this should be simple for someone like yourself), and take the SAT.
Then apply for college, you should be able to live off of loans while you finish and keep freelancing for some extra cash. You can get a computer science degree and be done by the time your 24.
Also if you need a little math help get this book http://www.amazon.com/Maths-Students-Survival-Self-Help-Engi...
Once again, you're only 20, you're smart, you'll be fine. Just remember that anything worth doing is hard--if it wasn't hard, everyone would do it, and it wouldn't be worth doing.