What's your major? Mechanics, optics, electromagnetism and heat are the four pillars of physics, the four most perfect physical disciplines at present, and also the basic parts of physics, so I suggest you start with these four courses, in order of difficulty: mechanics, heat, electromagnetism and optics (from easy to difficult). These subjects are not as abstract as quantum mechanics, atomic physics, electrodynamics and atomic statistical physics.

Obviously, it is very important to study these subjects. I recommend math textbooks for basic physics majors:

1. Advanced Mathematics (for physics majors) edited by Higher Mathematics Teaching and Research Section of Mathematics Department of Sichuan University Higher Education Press.

Book 1 (third edition), Book 2 (third edition) and Book 3 (third edition)

2. Advanced Mathematics (for physics majors) Higher Mathematics and Differential Equations Department of Mathematics College of Sichuan University compiled Higher Education Press Volume 4 (Third Edition)

One * * * four math textbooks.

Finally, I wish you a happy and successful study!