Hello, 

The cut off marks for state quota in Tamil Nadu OBC category was 350 and above in 2018. The cut off marks change every year depending on the number of applicants, number of seats available, percentile scores and the tie breaking criteria, etc. The cut off might increase or decrease in equal probability but the cut off won't change in a very wide range. Therefore, with a score of 269 the Chances of admission in government colleges in Tamil Nadu are less.

Good Luck.