/sci/ - Science & Math

I'm sure you goys get this asked a lot. I'm getting back into mathematics and I want some advice how on to path it. I've gone up to calculus at college and I did do well in that class, but I never had a good foundation and I'm thinking about starting back with algebra.

I don't want to meme myself by going through textbooks one at a time and taking a path that may not be necessary. What do you reckon I do? Is there common knowledge of how to study, what to study and what is useless etc? I work in accounting and I don't have too much free time, I don't want to learn what is not necessary to move up or even to just build a core foundation