Most rewarding cars for payments upto Rs. 50L per annum

Which card will be the most rewarding and beneficial for paying college fees of upto £55,000.

Currently use - ICICI rubyx with limit Rs. 7,20,000 Amex Plat travel with limit Rs. 6,90,000 Amex MRCC with limit Rs. 5,00,000

Will be splitting payments throughout the year and doesnt have to be one-shot payment.

Primary objective is to earn rewards points with not too exorbitant exchange rates.

Edit: open to applying for new cards too.