Are Barons SAT practice tests real past tests?

I took both practice tests from my Barons SAT Biology E/M book and got a 690 on one, the other I didn't score yet... The Barons tests in the book seem harder than the sample questions I am taking on the college board SATBio E/M website. So I want to know if any of the questions I'm answering are from real past tests, or are just based on questions from the real SAT.