will we have to know historical people for the exam?
Knowing people certainly helps, but on the FRQ a reference to someone of historical importance USUALLY says “so-and-so’s such-and-such theory.” For example, “Harry Harlow’s Monkey Study on Attachment.” I would advise making sure you are confident in the theories. (plus, you never know for sure what the test will feature)
I think that demonstrating a grasp of the significance of the person’s contribution is most important.
Knowing the people will help you, but you don’t necessarily have to know all of them! Just make sure you remember the “iconic” names, and the theories that the people came up with, so it could help you if you had to reference the person when discussing a theory!