The NEET 2017 cut-off marks for the TN Government Medical colleges admissions is available. You can review the same here :
This will give you an idea of the NEET marks you need to take in the current year NEET 2018. But, as mentioned in the above page, you need to be careful, as last year is the first year of NEET for the students from TN, and the performance is slightly on the lower side. This year the performance is expected to be better and on an average you can see about 20% higher marks. So accordingly use this page .
Please note that the list does not include the Tamilnadu Govt dental college.