I used EK which is concise but gets to the point. I would only use it if you are still in school or have recently graduated. Great practice sections in the back. Get another book for Psych/Soc though. Honestly, I took the Khan Academy Notes on Reddit and made Anki cards for the entire document little by little. It was totally worth it! Get the 100 page document though.
Also, it's not so much about which books you use or how much knowledge you have. This beast is looking for critical thinking. Quickly, get a base of knowledge then start practicing because a lot of the answers can be gotten correct by using the data and information that the passage provides you coupled with your base knowledge of simple topics. Good luck!!!