hey  

if you are scoring 270 marks and belonging to sc category then you can get govt college in karnataka only under state quota and not under all india quota. as per previpous year the cut off karnataka for sc under state quota was 375-261 marks in neet. we are sure about this year cut off as it changes every year depending on no.of candidates, no.of students and difficulty of exam. 

here is a link which has govt colleges of karnataka and their previous year cut off. i hope this might help you https://medicine.careers360.com/articles/neet-cutoff-karnataka

goodluck