Thank you very much Bill! I actually have been looking for decent sites, but either, like you said, are covered in a mess of ads, or are too advanced for what I need (I do want to learn calculus proper eventually, but I can't just jump in head first without the basics at a point where I am confident about them).

Fortunately, I have a skill with formula memorization, which was especially helpful with physics. So hopefully that comes back to me as well.
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"Man can focus his mind to a full, active, purposefully directed awareness of reality - or he can unfocus it and let himself drift in a semiconscious daze..." ~ Ayn Rand