how to get Gst certification as qualification

There is no such government course buddy....
But, There is one institute named vskills, Which provides Gst certificate course,

visit https://www.vskills.in/certification/accounting-banking-and-finance/gst-professional

what is gst practioner of cbec

A person desirous of becoming GST Practitioner has to submit an application in the form GST PCT-1. The application shall be scrutinised and GST practitioner certificate shall be granted in the form GST PCT-2. In case, the application is rejected, proper reasons shall have to be mentioned in the form GST PCT-4. The enrolment once done remains valid till it is cancelled. But no person enrolled as a goods and services tax practitioner shall be eligible to remain enrolled unless he passes such examination conducted at such periods and by such authority as may be notified by the Commissioner on the recommendations of the Council. Any person who has been enrolled as goods and services tax practitioner by virtue of him being enrolled as a sales tax practitioner or tax return preparer under the existing law shall remain enrolled only for a period of one year from the appointed date unless he passes the said examination within the said period of one year.