315 marks are still less even for SC category especially this year when the cutoffs are expected to go high greatly since you too might be knowing that the number of candidates had increased and also the paper level was called easy comparatively. So I guess government MBBS college looks a bit difficult for you since the last year the lowest cutoff for sc category was 403 marks. 

For further detailed information refer to our site.. 

https://medicine.careers360.com/articles/neet-cutoff-ap

Best wishes. Thank-you.