There are plenty of resources that will go through proofs and tell you about math. Much fewer resources that will give you exercises and some sort of framework

There are plenty of resources that will go through proofs and tell you about math. Much fewer resources that will give you exercises and some sort of framework to help you move through them. Khan does this really well for up to high school. Not really sure about beyond that. I think a good service could be worth $50/month, but I agree it’s a tough ask.