[logari]

I have read all the comments as of this typing. Some good, others okay. Ish. While there is no doubt that Khan Academy is really good, it depends on good for WHOM?

You don't sound like a typical KA learner, from what I see from your post, so a more accurate answer would be to ask you: how motivated are you to re-learn math?

If you are 110% motivated, I think you will have to first read Morris Kline's "why the professor cannot teach" which is an attack on the way math is taught starting from late 50's, especially in the U.S or the West.

After that, you will know what to do next. Depending on your future choices, you could start with building a strong algebra foundation before going to other branches.

To do that, you could read Polya's "how to solve it" as a general motivator, but as your main book, college algebra by Bittinger (or was it Bettinger) is the best that I know so far.

Make sure it is the pre 90's edition.