i'm sorry but id have to agree to retake, especially if you're applying to nova. i went to visit there a couple of months ago and spoke with an admissions officer. she said they're average dat ts/aa was at least a 19 this cycle, and an almost 3.7 gpa and 3.6 science gpa. i don't think these scores will cut it for nova, but they are not terrible.
i would recommend kaplan bb & subject tests, destroyer, cliffs ap bio, campbells, and crack dat pat and you'll be golden. good luck next time around.