Teacher is negligent in Ap Physics 1

I am currently taking Ap Physics 1 with a teacher that is negligent. This teacher is missing frequently, either sick or on vacation, leaving us with a substitute and no lesson plan for weeks at a time. The teacher does give small lectures but never goes into Ap level depth, and frankly, this teacher's lectures and attitude toward physics is about as dull as it could possibly be. They do give assignments, yet nobody in the class does them because we haven't been taught the concepts well and they are rarely collected anyways.

I would like to pass the Ap test but I'm not sure if just Khan academy videos will suffice. Any insight/advice would be greatly appreciated.