Hello Prayag Raj Chandra. Thanks for contacting Careers360 and we hope we will be able to answer your query. 

Note that admission to the post-graduate programmes of IITs is only through writing GATE exam. Note that the applications for GATE start around the first week of September, the exam takes place around February and the results get released before the end of March. 

For more information, may I please direct your attention to this Careers360 article:

• https://engineering.careers360.com/articles/iit-mtech-admissions

Please keep a tag on this page for regular updates regarding GATE 2019.

Hope this helps you and all the best!