Once the merit list has been prepared, a list of shortlisted and waiting Candidates will be released online. This rank list is prepared on the basis of marks scored in GATE in your particular stream. Shortlisted Candidates will be called in for Interview. This interview process is across all branches of IIST. So just to answer your question, there is a round of Interview for admission to IIST to M.Tech. For more information, please visit our page at: https://engineering.careers360.com/articles/iist-mtech-admission