I graduated high school 6 years ago and I decided to go to college after several years in the trades. I took Algebra I through precalculus, but so much of it seems to be lost on me. I was accepted to the school's computer science program and there's a math requirement most semesters (Calculus, Multivariable Calculus, Linear Algebra, Differential Equations, Discrete Math, Statistics & Probability) and most "non-math" courses have a significant amount of math concepts involved. Our algorithms course, for instance, is programming language agnostic and largely proofs-based. We also have to take calculus based physics, etc.

I'm worried that having been away from mathematics for so long I will be at a disadvantage. After reading the first page of my calculus book I realized I didn't even have a solid grasp of trig functions. Does anyone have any book/textbook, video, or other resource recommendations so that I can get myself on the same page as everyone else or even get a "head start" before taking calculus?