How much should I be taxed?

I am 17 and am currently working two part time jobs, 1 shift a week (8 hours) in job A and 1 or 2 shifts a week (anywhere from 8-16 hours) in job B on top of college. I have been working at job A for about a year and am earning minimum wage and have never been taxed. I started job B about a month ago and am earning... show more I am 17 and am currently working two part time jobs, 1 shift a week (8 hours) in job A and 1 or 2 shifts a week (anywhere from 8-16 hours) in job B on top of college. I have been working at job A for about a year and am earning minimum wage and have never been taxed. I started job B about a month ago and am earning just above minimum wage, I got my first paycheck from this job the other day and I was expecting to have earned £101, however I only got £57! I was so confused so I told my manager and she said I was taxed that much because I am working two jobs. She said I will get it back, but will this happen every time I get paid or is it just this once?
I don't earn over £12,000 so I'm pretty sure I shouldn't be taxed at all. Will I continue to be taxed this much because I have two jobs, even though I don't earn over £12,000 a year? (I also haven't gotten my payslip yet so I'm not sure exactly how much has been taken). I know literally nothing about tax so please explain this situation as simply as possible, thankyou. : )
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