Do not get a loan at 12% APR. Jesus. Don't be dumb.
A) Get a student bank account with a 0% overdraft - I have a santander student account which has a £1.5k 0% overdraft.
B) Look for bursaries and places who give you free money. Talk to your university student help desk. Explain the situation and don't be embarassed, you'll be one of hundreds doing the exact same thing.
C) Talk to your university job office about getting a part time job either in an external shop or for the student union - eg in the uni bars.
D) Be sensible with your money and work out a realistic plan with your parents etc. Even if you have to borrow some from them, show you can manage your money properly - eg show in a spreadsheet your weekly costs - and they'll be more inclined to help you. Even if you pay them back once you're working if they need the money, not paying interest is better than paying it.
Basically, talk to your university.
But seriously, you should of known this a long time ago and prepared for it. Get going to get something sorted ASAP.