Unit 3 — Trigonometric and Polar Functions — is where most AP Precalculus students hit a wall. The exam data confirms it's the hardest assessed unit. Here's what makes it so tough and how your student can come out the other side stronger.

If your student's school is teaching AP Precalculus in a single semester instead of a full year, you're probably wondering if they can actually succeed. Here's what's really going on—and what to do about it.