West Bengal has many renowned government as well as private medical colleges so the cutoffs are usually high. Coming to your question, the cutoffs change every year and its vary from college to other. So it is quite difficult to predict any fixed cutoffs. However last year, 372 was the least marks requires for admission in a medical college for a SC Category candidate and that college was Shri Ramkrishna Institute of medical Sciences and Sasanka Hospitals, ICARE Institute of Medical Sciences and Research and Dr BC Roy Hospital government seats. You can check the cutoffs here
http://medicine.careers360.com/articles/neet-cutoff-west-bengal
According to last year's stats, a score around 420 in Neet, if you belong to SC Category, can help you to get placed in a reputed government medical college. Now this year the cutoffs can change. So you can use Neet College Predictor tool to know where you have good chances
http://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer