I think more important is mentally, you are fit. That means, you
are mentally prepared to go to NS, and accept the fact that it is
going to be a whole different world altogether. Be prepared to wake
up DAMN EARLY every day, that you will be scolded and screamed at
and punished by your sergeants. That u will feel alone and helpless
at times, but do remember that there are thousands of people going
through the same thing with you all the time.
If mentally u are not prepared, then I guess its useless even if
you are fitter than fit.