I'm in the same situation (I literally had to start with "what is a factor again?") and I've found just doing a little every morning works. It's slow but learni

I'm in the same situation (I literally had to start with "what is a factor again?") and I've found just doing a little every morning works. It's slow but learning one or two concepts a day avoids frustration. Selby's Practical Algebra was good and then worked my way through Schaum's Precalculus book, supplemented by stuff on the web.