Best ways to prep CPR knowledge before the in-person class?

I have a CPR class coming up in two weeks through the local fire department — a combined CPR/AED course for lifeguard applicants. Most of my coworkers have never taken first aid training before and I want them to arrive with at least a basic conceptual foundation so we don't spend the whole session reviewing fundamentals.

The physical skills — compressions, rescue breaths, AED pads — can only be drilled in person on a mannequin. But the knowledge side — compression rates, depth guidelines, infant versus adult differences, when to use an AED — can all be studied ahead of time. I want to understand how to perform CPR correctly before trying to absorb it all in real time.

I found the Child and Infant CPR practice questions on PracticeTestGeeks which cover pediatric differences well. Are there other approaches you'd recommend for a group that's completely new to CPR training? I'm especially looking for resources covering choking response and AED use alongside compressions.