HaoJin

Actually, I skipped PCALC. But I did take it at Harvard for 2 months.
There are many topics in PCALC that you won't be needing in calculus.
The fundamentals are the values of sine, cosine, tangent, their reciprocals, and the graphs. Once you know that.. the beginning of AP Calc (well for me) was basically a re-teaching of the fundamentals of precalc (as stated above).
I wouldn't say it's a horrible idea to skip.

esquiar

It REALLY depends on what exactly your school does in pre-calc. Some just use it to recap algebra 2H/Trig, but others actually start on the "A" portion of Calc AB.

At my school, we started basic differentiation 1.5 months into PreCalc, so then when I did Calc BC this year, the entire first semester was a breeze (our semester final was an old AB test). All the derivative and trig practice we did + the intro to parametric and polar graphing were way worth it.

The best way to figure out what's best for you is to talk to the math teachers at your school who teach PreCalc and Calc ABC so that you really know what's going on.

CC people try to be helpful, but none of us actually understand your school's curriculum or your math abilities.