<p>I agree with ADSRSM and BCEagle, and I think it’s great that you’ve come as far as you have. If I might make an additional recommendation - you might want to buy a copy of the books Calc for Dummies and Trig for Dummies. I’m serious here - they’re really good references when you’re struggling with a concept and can give you a basic understanding of trig concepts that you can build on. When I tutored precalc in my high school (and later took calc myself), I found that they were really helpful in keeping up.</p>
<p>I think you can do it. Obviously you’re very willing to work hard and you’ve come a long way. Ignore the people who put you down and listen to some of the helpful advice that is posted here.</p>