cylinder head is leaking

Where is the leak coming from? If it is from gaskets, the job was not done well resulting in the leakage.

the leaking is from gaskets

Whomever did the repair did not perform the job well and you should get back to them.

i had do it twice & i m sure that i had done the job as well. the cylinder head had skim before. it is true that can not skim the cylinder head.

You can skim the cylinder head but the job must be done well. If the finishing is poor, then you can have leakage problems. Which area is leaking and what is leaking?

exhuast area is leaking. engine oil and water.

That can be a fault with the head, gasket and block. Water and oil leaking means a serious fault and visually you should be able to see something.

Was the cylinder pressure tested?