Try Terence Tao's book Analysis I, start at chapter 2 if you forgot trig. Defines naturals, integers, rationals and reals from scratch teaching you how a proof

Try Terence Tao's book Analysis I, start at chapter 2 if you forgot trig. Defines naturals, integers, rationals and reals from scratch teaching you how a proof works at the same time. When you get to the calculus chapters watch Gilbert Strang videos with the book if you want extra insight but Tao's book is clear enough without needing secondary resources. There's a free sample of the first few chapters and the excellent appendix on basics of math logic https://math.unm.edu/~crisp/courses/math401/tao.pdf https://math.unm.edu/~crisp/courses/math401/tao.pdf All those proofs in probability and stats/linear algebra classes will make sense after imo