Hello,

That it is  based on number of colleges and seats available per college, no.of application and so on . The cut off marks are released only once when the counselling is over. generally,The cutoff marks should be approximately 270 + in NATA to get admission in Anna University( this may vary). the minimum of 50% in class 12th in order to get eligible for the exam if  you're a general category student and for the SC/ST the cutoff is 45%.in 12th class. during admission some of the colleges accept with 50-50 weightage wheras some with 60-40 weightage of NATA score vs Board marks.