If you want to learn college physics by yourself, you must have mathematical knowledge as the support, so you must learn advanced mathematics. College physics involves calculus.

I see that you bought college physics and competition physics, both of which involve calculus in advanced mathematics, so you should study advanced mathematics at the same time. If you still don't understand it well, you can listen to the video of physics course on the Internet, and then buy the corresponding exercise book as a knowledge consolidation exercise.