hey student

without knowing you category it is difficult for me to answer your question. however last year, i.e. 2018, the tamil nadu neet cut off for state quota for government medical college was 665-588 marks. you can further analyse previous year cutoff for government or private medical and dental colleges in tamil nadu by visiting following link https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu

you can predict your rank by visiting following link https://medicine.careers360.com/neet-rank-predictor?icn=NEET_rp&ici=NEET_article_view_sticky

if you are further confused then you are welcome to ask further question. 

thankyou. goodluck.