Surya Mythili

Hi, I am a student right now, and i work at two different places, i work approximately, 3 hours a week in my first job and 17 hours in my second job. i am going to get my pay tomorrow and i just saw that i am taxed flat 20% on my second jobs salary. so is there any way to change this, like me getting taxed on my first job rather than second job. and i think in this year i will earn less than 12570 pounds. So is there any way to change it. Since my shifts in each of the work is changing, i cant say any how much i will earn, but if i am taxed in my first job it would be less and appropriate as i do maximum number of shifts in my second job and taxing that means i get paid less for a month. Is there any way to clear this out. Regards, Surya