Khan Academy's precalculus course is a free set of video lessons and practice exercises covering the algebra and function topics needed before calculus. The site lets learners watch a video on a specific topic and practice it.

One commenter recommends it as a starting point for someone already comfortable with algebra, and suggests using the site's videos to fill in topics they find hard.

What commenters said (1)

1. RecommendsRiderOfGiraffes2010in “Electrical engineering”

   I can recommend this site: http://www.khanacademy.org/

   I suggest you find a video there that you're interested in and that you can't quite understand, then come back and ask a question. You said you were OK with algebra, so pre-calculus would be a good place to start.

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