Khan Academy good enough for AP Chemistry?

My AP exam for AP Chem is coming up and my teacher taught the class all out of order and skipped over many concepts, teaching equilibrium and acids/bases BEFORE thermodynamics??? We likely won't finish before the exam as well. I want to get at LEAST a 3 on the exam, preferably a 4. I am taking 3 other AP exams and am very confident about them but AP Chem not so much. If I grind the Khan Academy out before taking some practice FRQs, is that good enough?

(So far I've completed units 1, 5, and almost all of 7 on khan academy)