What should i be getting taxed on my 2 jobs!!! help?

hello everyone, hope someone can help me!!!! i currently have 2 jobs and i think i am getting taxed far too much. i work at one job doing 110 hrs a month and getting minimum wage and on my 2nd job i do 64 hrs at �6.42. what should i be getting taxed a month before i ring up the tax office. thanks nicola