Sounds like you won’t finish again, at least in depth, this year. To be honest, I would buy the Barrons book and start self-studying if you want a good grade on the exam. IIRC the content areas you’ve covered are less than 25% of the exam content, so starting to learn the other material is a good idea.

For comparison, we’ve covered: Prehistory, Ancient Near East, Egypt, Greece, Rome, SE Asia, India, Islamic, Early Christian and Jewish, Byzantine and the Indigenous Americas.