Should I Buy or Not Buy

[Rever2018!]

Hello everyone,
I currently have the 2013 MCAT Prep-book. In 2015 or 2016 they added 2 more subjects into the test; biochemistry and psychology. Should I keep the rest of the 5 books I have now and just buy the 2 books added into the test? Or should I buy all new set of prep books?

Thank you!

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[aldol16]

MCAT content changed from 2013 to 2015 because they have a new version of the test. Medically-relevant science is emphasized now so you're not going to be asked questions about calculating trajectories of projectiles and useless **** like that. Fluid dynamics would be more important. Biochem is also now being tested and makes up a sizable portion of the exam. You should probably look at new prep materials that are at least reflective of the new exam.