Yes, pre-calc is hard, but if you made it through the other math classes, you will be primed for another challenge. Pre-calc was not available until my senior year - we had to follow the math track of algebra I, algebra II, stats, geometry, trig, and pre-calc and then calc. I do remember being a student mentor in the algebra classes but needing a student mentor for pre-calc.
Here is a site for pre-calc.
Pre-Calc/Calculus - Math for Morons Like Us
A tutorial for pre-calc.
http://archives.math.utk.edu/visual....s/0/index.html