No worries.........There is no exact deducation % in the paycheck. It all depends upon various factors like, single or married, childrens, payrate, payamount, ur dependent, and many more.....

During OPT, there is not SSN and medicare tax . While in H1-B you have to pay these taxes. In few state, there is income Tax in top of it. The higher you make, the deductible % goes up. A person who makes 1000 in 2 weeks might have 100 as tax, BUT person who makes 3000 biweekly will have more than 3000 tax cut.

Anyway, all these should not matter, You will get all the tax return that you paid in excess at the end of the year. If you want less tax cut , just increase the dependent claimed. Put it 5, you can go upto 10 or 8 I think.

But, rember, you might end up paying at the end of the year, if u have paid less.