So I'm failing 2 classes and I have a D in a couple others, and my older sister (who pays for the Netflix) changed the password until I get my grades up to A's, B's, and C's. She's super pissed and I'm trying but I can't bring them up. I don't know what to do and I'm giving up. She thinks I'm really smart and lectures me on how she didn't give a shit and how now she owes a lot of money. What do I do?