Anand Rathi use a different convention, and it works against you at the start. The entry level is set at a margin ABOVE the closing level on the primary trade date, then rounded up to the next multiple of 100.
On their Nifty notes the margin is 150 points. If the Nifty closes at 24,152, adding 150 gives 24,302, which rounds up to an entry level of 24,400. If it closes at 24,150, adding 150 gives exactly 24,300, already a round hundred, so it is left alone. On the Sensex note the margin is expressed as a percentage instead: the closing Sensex plus 0.6%, again rounded up to the next 100. The two work out to roughly the same handicap in percentage terms.
The consequence is worth being blunt about. Your entry sits above where the index actually was, so the index has to climb that gap before your measured return is even zero. On a note that needs a 36% or 39% rise to pay its full coupon, that handicap is part of the deal you are accepting.
The exit is averaged rather than struck on one day. On both notes it is the average of the closes on seven quarterly observation dates, in the 38th, 41st, 44th, 47th, 50th, 53rd and 56th months.