The offer price is the final price on which shares are allotted. As it is a book building issue, the issue will be available in the price band for bidding. The investors who bid in the employee category can bid at any price in the price band. After finalising the offer price, the bids which are received at or above the offer price would be eligible to get allotment.
The best way to bid at or above the offer price is to bid at the cap price of the price band.