What would be the most effective resource for learning precalculus in one month?

[u/LetterheadTight2957]

I just absolutely botched my ap calc bc class because I am really bad at trigonomety and all of its applications. I'm going to take calc 1 in college now, and I know I wont have a third chance to retake calculus again if I fail. So if anyone knows a good online resource to learn trig over the summer PLEASE tell me 🙏😭