Are the Math classes on Study.com any good?

[MNomadic]

Whatever provider or study source you choose, I urge you to supplement with a good textbook and solutions manual. Mastering math requires doing lots of problems, and if you're teaching yourself, then the solutions manual is priceless. Note: a solutions manual is different from just having answers like the back of a math textbook usually has. The solutions manual will actually walk you through HOW to solve the problems. I don't think I would have gotten through Discrete Math without one. Luckily, textbooks are dirt cheap (like $10 shipped) if you don't have to buy a particular (new) edition and don't care if it's used.

What's a good book for the required math classes for the CS degree?

Openstax has free online textbooks for math up through calculus. Not sure if they have solutions manuals.

I have had success using free online math solvers like this one: https://www.mathpapa.com/equation-solver/
To show me step by step how to do problems I struggle with. I know they have some that work for calculus/differential equations as well. Btw I don't remember exactly which free sites/apps I used but it shouldn't be too hard to find with Google.