I neglected math a lot in HS too and tried the Khan Academy route, but figured out over time that you really can find your gaps and fill them on demand by focus

I neglected math a lot in HS too and tried the Khan Academy route, but figured out over time that you really can find your gaps and fill them on demand by focusing on the work you want to do. I wouldn’t discourage you from trying a more comprehensive approach to building a great foundation in math. Math is awesome and if you enjoy it, go for it. If you want to stay focused on ML, you might do alright by figuring out what you need as you go. Just walk back from each problem until you find your bearings, then dig in. Math is huge and you could find it takes forever to arrive at the skills you need to do the specific thing you want to do.