As per the Guidline of Sponsored candidates of IIT KGP for M.tech,/M.Des./MS (Research) and Ph.D. (Engg. and Earth Sciences) Program-

A sponsored candidate must have been in service of the sponsoring organization for at least two years at the time of admission. The sponsoring organization must specifically undertake to provide full salary to the candidate and to relieve him/her to pursue the programme for its full duration.

Fulfillment of GATE requirement may be waived for such candidates. However they will be called for the interview and may in addition be asked to take a written test.

Good Luck!