The best way to pull it up is to take a lot of post-bacc classes. These grades are actually calculated into your AMCAS GPA. Another alternative is a masters program, but I wouldn't recommend it if you want to raise your GPA. Those grades aren't included in your AMCAS GPA (however, since you were a science major, I'm not sure what other choices in post-bac classes you have left so a masters program may be a valid choice). Also, you should really strive hard to get a good MCAT score to compensate for your GPA.