Ouch...I feel you're pain. >.< Although I'm not failing anything, my mom's really...let's just say concerned when it comes to my grades. Okay, obsessed with might be a better phrase. If I don't get all A's, she convinces my dad that I've totally done something wrong and they punish me together. I'm talking from experience, too. I had A's in everything except for a C in math, once (which sucks, too, they know how much I hate the subject) and they grounded me from the computer and TV for a month. Ugh. >.>
Good luck with PS, btw. Hopefully it's easier then Earth Science. -.-