Is gst registration mandatory

ravi agrawal (student) (1 Points)

20 March 2018  
Sir
I am currently working as commission agent of various textile goods in state of BIHAR, city Muzaffarpur. 
In this, out of state supplier bills directly to Customer (B2B)
on our assurance and mentions our name in Agent column of bill.
At year end, supplier computes our agent commission at a fix rate
as decided earlier and credit the amount in our account. 
Will I be liable for GST?