Hi
It is not possible to accurately predict the cutoff marks i.e. the lowest marks which will get admission under state quota for Tamil Nadu MBBS admission in 2018, because the cutoff marks vary with difficulty level of the exam, number of candidates appearing in the exam, etc. However, you may get an idea of the same from previous year cutoff marks.
In 2017, lowest marks from various categories which got admission in State Quota (in government colleges) are given below:-
Hope it helps!
All the best for upcoming exams!
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