I’m currently a junior, and hopefully I’ll independently study pre-calculus over this summer to fill a pre-requisite for AP Calculus. I’m looking for a good textbook that will cover all of the necesarry topics, and maybe a few tips for someone who is going directly into Calc BC from pre-calculus.
Here are some on-line quizzes that you can try to determine how well you know your precalculus material and see how ready you are for calculus:
http://www.math.buffalo.edu/rur/rurci3.cgi
http://math.tntech.edu/e-math/placement/
https://math.berkeley.edu/courses/choosing/placement-exam