I definitely think you should be able to raise your scores in 2.5 months. Good luck!
I just did a Princeton Review FL (the demo), without much studying, and got a 496. I've taken the basic science prereqs (but nothing more) over the last 2 years; I'm a non-trad student with an arts undergrad. I'm hoping to do much, much better, coz I really want to get into my state school, and their minimum is about a 512 at least. I'm not taking the MCAT till June, and I'm about to get started on content review. My plan is to work through the content in TBR books, do practice questions, and then start doing FLs once I've reviewed about 70% of the materials.