Since you're running out of time the best and the only advice you can have is to reach your nearest Samsung Service Centre and have your phone inspected and repaired ASAP.
Hello @SUBHAM_003There's this thing through which you can check the various components of your phone and that includes the vibration too.First go to the Keypad and Type/Dial *#0*#, post this these instructions/options will appear on your screen (i ha...