Hello student,
Yes, With the score of 400, you have chances of procuring a seat in the government medical colleges when comparing the results of previous years in Kerala. Last year, a score of minimum 385 got a seat in the Government medical college,  Palakad in SC category under the state quota. But one thing to keep in mind is that scores and ranks vary each year with difficulty level of the question paper and availability of seats. However you can predict the colleges which you are likely to get using the given link
http://medicine.careers360.com/neet-college-predictor
Good luck

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