Difficulty level of questions in exam test, sat, recently, studying, similar

thisisbrianly

I am studying the curriculum books. I read the whole chapter and do the EOC questions. I recently finished studying FRA. Then I happened to do self-test quiz from Kaplan for FRA. Honestly 24 questions in that self-test were much harder than EOC questions in book.
So I am wondering, are the questions in test similar to EOC questions or Kaplan questions are more indicative? Someone who has sat in the exam and studied both will have an answer.
Please advice.