By recommend, I mean content you actually find to be high quality, well done, and easy to absorb and follow. By relearn, I mean I have forgotten everything I ever learned in high school.
Another comment mentioned Baron’s workbooks. Any other resources for exercises which you’d recommend?
Ok, I emailed my friend (above) and she said Khan Academy and she says it has exercises. That’s great, I had thought it was just video lectures. So I’d go for that.
I’d expect textbooks would have tons of exercises at that level. Schaum’s outlines are good for college level math but I don’t know if they have them for stuff like basic algebra. I have a friend who is a HS math teacher so I can ask her for recommendations and get back in a day or so, hmm.