So I took Calc 1 about a year ago, and barely squeaked by with a 70. The professor obviously passed me out of pity. I did horrible and if it wasn't for participation grades my grade would have easily been closer to a 30.

My fundamentals in algebra and trigonometry are extremely shaky. I went through my first Cal 2 lecture and quickly realized I had to drop the course because I was completely and utterly lost, couldn't do the basic review homework.

I guess I'm wondering where I should start so that I can be ready to take Cal 2 by next Fall? Is there some assessment I can take online to find out where I should begin learning? Basic Mathematics by Serge Lang? I simply want to truly understand the material on a theoretical level, meaning I want to be able to do proofs.

I know this is an utter mess grammatically, and I'm in a bit of a panic realizing how long I've been in school and wondering if I will be able to pass Cal 2 and Cal 3 in the future. Where should I start? Where do I even begin? Should I just start from my schools Calculus book beginning to end? Is 7 months enough to master Cal 1 and trigonometry?

I really want to know this stuff, I know one thing it requires is lots and lots of practice and I'm willing to do this I just need a direction.
Thank you all, I'm in panic mode.