Hi, the cutoff marks in 2018 for SC/DT/OBC out 720 were 118-96.
For all India Quota seats the expected marks for OBC category were 288+ and expected cut off marks for Kerala were 267-303 for OBC.
In order to avail seat in good govt college your score should be around 469-467.
Although it's impossible to determine the cut off marks as it differs every year, you can predict your college by subscribing to career360 college predictor in which you can enter your rank, category and desired course.
Mostly a score above 500 gets you a seat in good govt college, so the chances with your score are a little less unfortunately. But don't loose hope. In order to be sure try and use the college predictor.
Good luck

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