My undergrad GPA wasn't stellar by any means- I had a 3.1. I didn't even take either GRE exam. However, I had 3 years of serious research under my belt. I completed an REU at the school I'll be attending in the fall, did a research project my junior year, and went to China for an internship my sophomore year. I knew what group I wanted to join in graduate school, and during my REU I made it a point to work with that PI in particular, and he ended up writing my rec letter. All of this is to say contact the lab you are interested in. Reach out and see if they even have available space and if you can do any kind of research with them. Your dedication to research is what will get you into grad school because all the grades and perfect exam scores don't mean much if you don't have lab experience and rec letters that show you're committed.
