Hi,
There is a possibility to claim back the IGST if your service falls in the basket of export of services.
With respect to income tax also, you can opt for presumptive taxation, if you meet certain conditions. In that case you will have to pay tax only on 50% of your income.
To give your exact answer, we need to discuss the facts in detail.
Please feel free to call/ revert in case you need more clarity.