I'm at uni and I'm planning to transfer into physics, but I want to improve my maths game first. Unfortunately, I made the stupid decision of doing lower level maths in high school, so it's ok but not that great, and it doesn't look like there's really any books on the sticky intended for my level.
Does anyone know any good (advanced) high school level textbooks I can use to learn from?

Pic kinda related as my knowledge of maths is around that level