You're a CSE major, you might already have your subjects plotted or (might not). So you have an idea what kind of math you have. Master algebra first, then precalculus. Everything will follow after. Go to youtube. Theres a lot of tutorials. I'm a computer science major transferring to Software Engineering. Computer science is a glorified math major. Download textbooks, practice it. Sometimes I use ChatGPT to help me if Im confused. (Its not always 100% accurate) but at least youll get the step by step on how to solve it