Precalc help is any tutoring or extra assistance with college-level algebra and trigonometry intended to prepare a student for calculus study. Precalculus is often offered as a class, but when it is not, students preparing for calculus should probably seek out such assistance themselves.
There are numerous places online where students can find precalculus help for free, including Khan Academy and iTunes University. Students who need a more-rigorous course of study can usually find college math students offering tutoring. College prep courses offered as a means of community outreach by colleges or adult education programs provide inexpensive precalculus classes, as well.
Precalculus is not the same as trigonometry or advanced algebra. Students who are weak in math should probably take trigonometry and advanced algebra prior to taking precalculus.