You seem to have chances based on your percentage. You can refer to the sastra official site for more details.

The merit ranks for Stream 1 based on the JEE Main 2017 scores and the normalized 10+2 marks for 70% of the seats. Rank List or merit list for candidates applying through Stream 2 based on normalized 10+2 marks is announced for 30% of seats.

Check the site for details.

Good Luck.