With such a good percentage in 12th standard,  your KEAM score after normalisation will be definitely increasing your rank. You can get between 30,000 - 45,000 rank (this is only an estimate). Yes, you can definitely obtain very good self - financing colleges like Mohandas, Heera or even some government aided colleges like SCT, LBSITW (for women), and also colleges under CAPE. 

There is a large vacancy of seats in most self financing colleges in Kerala, so they would do the maximum to admit students via merit seats.

If you have more doubts, ask me!