Do I start studying for the MCAT now?

So I am a sophomore and I am wondering if I should take the MCAT at the end of the summer. I want to do this because I don't want to take the MCAT during the school year or take a gap year(s). I was thinking about starting June 1st and taking the exam early September. I have will have taken all my prereqs except physics 2. However, I am really rusty on pysch/soc and I was never taught the physiology/anatomy parts in my bio class that show up on the mcat ie endocrine system, cardiovascular... Do I start studying for the MCAT now?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums