Tax credit?

Do u know about working tax credit and child tax credit?? when u earn more money at work u will get higher tax credit?? or when u earn more they will give u less money from tax credit???? becouse i found on my form they said i get 22 000 for last year but i get 11000. so im worry maybe i have to pay them back some money?
Answer
I dont know for sure but it seems like the less you make, the more you get. you should ask a tax person