i'm glad i'm not the only one giving this advice, but don't sweat it. i freaked out and almost didn't apply to med school because i made 5 C's in pre recs. 2 c's in org chem, 1 C in gen chem, 2c's in physics. i made a b in genetics and b in zoology. i ended up with a 3.5 in engineering from a state school with a good engineering program, but i freaked out big time and basically thought i had no chance. when i was staring at a career i wouldn't have enjoyed, though, i decided to give it a shot. i eventually did well on the mcat after 3 tries, and i just got into my state med school. cheer up, and just learn from your mistakes. my problem in school was i used every other excuse for my grades other than the fact that i just wasn't putting forth enough effort. after 3 years of undergrad, i put forth the effort and averaged a 3.8 my last two years. if you do the same, all of the c's will be history. btw, my c's weren't brought up in interviews either. one lady actually told me that i shouldn't be hard on myself, that i had a lot to be proud of. good luck.