I tested into calc without ever taken precal. I don't even know what precal is so I don't think it's necessary to take it because I got an A in calc. I guess the stuff I learned from Trig was all it took to make it through calc.
Personally, I thought Calculus was easier than Pre-calc in high school. I took and passed AP Calc exam, so I really didn't have to take the calc again in college.