You havent mentioned your Category. Neverthless, in 2018 under State Quota the cut offs for various Categories have been aa follows:

General  Category: 558
OBC: 471- 558
SC: 385
ST:  278

Going by previous cut offs and your score, you have a fair chance at a Government Medical College in Kerala. Having said that, cut offs change every year and are dependant on various factors like no.of seats availble, no.of candidates appearing for the exam, top NEET score and difficulty of the exam. You can check the cut offs of each college at:
https://medicine.careers360.com/articles/neet-cutoff-kerala/amp

You can also use our College Predictor services to check your options:
https://medicine.careers360.com/neet-college-predictor?utm_source=google-search&utm_medium=paid&utm_campaign=neet-clgpd