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You just need to practice. Get some educational practice workbooks meant for students and complete them.

I'll say solve some basic operation type questions in a puzzle. Now regarding math concepts like calculus I'm sure if you understand the concepts you can do it. Probably see khan academy videos or oganicchemistrytutor vids on yt , one thing that I do not like in math is formulaes remembrance and I forget formulaes often so I write the formulae in a book and I see the formula and use it to solve questions , you will automatically learn formulaes and properties. Alright now that it's done I would suggest you solve problems from basic , solve basic ones first, then solve a bit medium ones which will require some brain and then solve hard ones which require brain and usage of multiple concepts. Also enjoy the process and solve it with a smile and take it up as a challenge. That's all peace ✌️