In order to boost your sGPA, you can always take non-major bio courses, lower level math courses, or even astronomy. I would find your strong suit in terms of academics, and go down that route. For instance, if you have a fond interest in astronomy, I would take astronomy. If you're proficient at math, take college algebra or pre-Calc. I'm not sure about your University. But you should do some research to fit your needs. Best of luck!