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Sports is an integral part of life in Army, you just can't survive in army if you are not good in sports. Regarding certificates, no body cares, as a veteran( or any sports enthusiast) I can easily make out whether a student is good in sports or not.
For SSB, sports certificate are not required, a student should be able to complete the physical task/test with efficiency and flexibility, that's all a examiner demands.
But it doesn't mean that you can make false claim without knowing anything about a game. Believe me, Interviewer will get to know the truth.
Best of luck for SSB.