Trading in call options

Suppose if i buy a call option for a total premium of 1000 rs. and on the day of the expiry i can see i will be making some profit if i exercise my order. Now the strike price is 100 for 100 units. so do i need to pay 10000 rs. again in order to exercise the buying and then again sell it for the profit ? or i can just book the profit directly by exercising the buying of the options? the options markets is cash settled in India.

Yes in india Options are settled in cash. so need to pay cash again for exercise.
I would suggest you read options module on Zerodha Varsity