You should not have to pay any Indian taxes, make sure that is spelled out in your contract, then it is a matter of where you want to transfer the money. If it is the US, perhaps a couple of back accounts , and transfer less that 10 grand at a shot. Or walk some of your hard earned money in when you return. The Indians do not report to anyone outside of India what you make.
The Fata test is not hard, but you do have to study for it. There are some test and answer study tests floating around, you will need to study the Indian regulations on duty time, disease's and quarantine issues, no fly areas, etc. I was given a bunch of old test questions with the answers, and they change the 60 question test so those questions get recycled back into the new test. Probably up to 50 % of the actual test questions were on the test copy I received.
Good Luck