Thanks for all your comments boys gizakallah.
E is for economy D is for drive S is for pure madness.
Joke its for Sports. in economy mode even if i kick down it doesnt drop gear but raises RPM very smoothly keeping the economy excellent i m talking around 550 + KMS in full tank in the city.
In D when i put my foot down it drops gear and vrooom.
In S like i said pure madness.