You haven't mentioned your Category. Neverthless, in 2018, under State Quota, the cut offs for various Categories have been as follows:

General Category: 370: Rajah Mutiah Medical College

OBC: 357: Rajah Mutiah Medical College

SC: 239: Rajah Mutiah Medical College

ST: 184: Rajah Mutiah Medical College

Now this is 2018 data and cut offs change every year. Cut offs change every year depending on various factors such as no.of Candidates appearing for the exam, no.of Candidates qualified, top NEET score and difficulty of the exam. For a seat in any Government Medical College of Tamilnadu, you need to score atleast 50-75 marks more than those mentioned against your Category.  To help you with your NEET preparation, we have NEET Knockout packages that you can check at: https://learn.careers360.com/knockout-neet-may/. To help you during admission and counselling, we have https://www.careers360.com/mbbs-companion.