GST rate on commission on brokerage of saree.

Rate of GST will be 18%

Yes, it will be 18%.  Refer Sr.No.15 (v) (heading 9971) of notification:

https://www.cbec.gov.in/resources//htdocs-cbec/gst/Notification11-CGST.pdf

Hello Sir,

I want to know whether the commission agent of sarees are mandatorily requirred to get themselves registered in GST?

Even though they fall below the threshold limit.

Thanks