Don't know what Kaplan looks like.
I had only Decks and released papers and of course books from my school.
Those are books I have studied with and the best book to study basics.
I thinks there are no basics for part II, which makes people including me think it is easy exam but tricky to score well.
Also think it is waste of money to buy materials other than decks and old exams. I did all the released exam for sure. After the test, I found out there was a question straight out of 77? 76? exam. Well, I hope the answer didn't change after 30 years!!!