In 2017, 477 marks under BC Category secured a seat in Chennai Medical College. Infact, the cut off was much lesser for 2017 under BC Category. We unfortunately do not have 2018 data with us. But you can expect a GMC in Tamilnadu with that score. Having said that, cut offs change every year and are dependant on various factors like no.of seats available, no.of candidates appearing for the exam, top NEET score and difficulty of the exam.