Hey, i just interviewed in November. the best thing you can do is just be honest, tell them you tried your best, they may ask what you are doing to prevent it from hindering you in the future. when confronted with my numerous poor grades in Mechanical Engineering at my school i told the admiral that I'm always putting forth my best effort, and i think the most important thing about that is that i sounded confident when i said it. i don't let my harsh grades affect me because i know the material now that i use it. i went in with C's in Thermodynamics, Heat and mass transfer, and Calc 2.