Hello student,
With a score of 538 in BC category, it becomes difficult to secure a seat in the government medical colleges when comparing the results of previous years. Last year, a minimum score of 588 was required to fetch one a seat in the Rajah Muthaiah medical college, Annamalainagar in BC category under the state quota. But, scores and ranks vary each year with difficulty level of the question paper and availability of seats. However you can go through the following link to know about the cut off's and ranks for the previous years and calculate your chances of selection
https://medicine.careers360.com/articles/neet-cut-off/amp
Good luck