It's funny but yes this little book is all you need. watch how the MCAT is covered on AAMC exams and that should give you confidence. MCAT orgo is oversimplified from what you generally learn in class. None of the other subjects are like this so it is weird.
The first 3 chapters are rather complete. Learn ALL of the flash cards as well!!
Don't neglect the lab stuff:
You will want to get a solubility chart. This is a common orgo procedure not covered well in the EK book. I got one from my pavia lab book.
You may want to go over tests(Tollens, permanganate,etc.). Got this info from ochem 1&2 lab material.
I think you should take a look at how they presented calculating degrees of freedom. For some reason I'm thinking that it was missing something.
memorize OH peaks and c=o peaks for IR
understand how to read NMR, coupling, and basic peacks like aromatic, methyl ketone,etc. NMR has been popping up on MCAT lately
EK Orgo is great but you should go over various tests for compounds and solubility since EK does not cover these topics.