Try to demonstrate your mastery over the subjects by scoring very well on Chem and Math2 SAT subject tests (requirement) and also 5s on APs related to as many as possible in BCPM (Bio, Chem, Phys, Math). That way you will be sending them a convincing message that you are as good, and perhaps even better than those applying with higher gpas, but probably a shade lower in gpa because of high competition in a tough school. (they understand, themselves being a tough school). Also academic rigor considered as their top priority in selections across the board.