Small loan for 18 year old

Hi I was wondering if anyone had any advice about getting a small loan of £500. I’m 18 years old and I need the loan as I am a private candidate needing to pay for my summer exams which all together is £500. The issue is I work agency work so the past month there hasn’t been many shifts so I basically don’t have enough. I was wondering any places that would consider giving me a loan of £500. More shifts have come up but I won’t get payed until after the deadline which is feb 10th so I need to get the £500 before the 10th of Feb. Any tips places to look. I can’t ask my parents and don’t have friends who have £500 to lend.