Best Paid Part Time Jobs.

Hello All! I need some help, basically I want to move out of my parents home for various reason that are not really relevant. Where I live I can rent a one bed flat for around £325-450 pcm (including bills) This means I will need to earn £800-1000 a month. Unfortunately I don't qualify for minimum wage as I'm under 18 but I know that some big companies like Tesco do equal paid for all regardless of age. I just need some advice on places or jobs that may paid a high enough wage with enough hours to receive a wage like that per month. I know that If I work 30 hours a week at around £7.30 per hour I'll earn enough do this.

I have been looking for jobs and have apply for all sorts of places; I haven't even been given and interview and I'm really not sure where I'm going wrong, I believe I'm falling down on the online quizzes they make you take about customer service; As I've never had a job before I'm unsure how to answer this questions. If anyone has any advice on how to answer these questions it would greatly appreciate it.

Finally I appreciate some people will not agree with what I'm doing however this is not the place voice your opinions please understand I haven't rushed into this decision, I have done lots of research over good few months and this is defiantly not a rushed decision.

Thanks for all the help!