Is gst applicable to me

I work from home for US client.The work involves connecting to them remotely and do data entry and some account reconcilliation work on their system.

Total receipts are less than 20L.

The client wire transfers the amount which comes directly to my bank account.

My question is 

a)Do i need to register for GST and then file return as zero rated supply.

B)since the export of services are exempted from tax and my total receipts are below 20l,i don't need to register for GST.

Kindly advice.