Hello Dear,
Backlogs or supply don't really matter because they just need a candidate who is capable of facing hardships at m.tech at IITs. But the main point is that you need to prove yourself in written test and PI(personal interview). Because a cgpa of >=6 is not so convincing, but still if you manage to ace WRITTEN TEST/PI that really make them think about your application. Apart from these don't forget to maintain a good gate score which is a pre-requisite. All the best and good luck
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