Hello Pracheta, 

Cut off percentile depends upon many factors like number of students appearing in the exam, total number of available seats, difficulty of the exam and the category under which admission is sought. 

If the number of students appearing in the exam increases the cut off will increase and if number of students appearing in the exam decreases the cut off will decrease. Likewise if the number of seats increases then the cut off will decrease and if the number of seats decreases, the cut-off will increase. 

From this year NTA is conducting the JEE Mains exam and instead of scores, it is giving percentile. 

Last year the cut off for the general category was 74. If we roughly calculate then this marks comes out to be around 85-90 percentile. For OBC category the cut-off marks was 45  and corresponding percentile would be somewhere around 65-70 percentile. For SC/ST the cut off was 29 and 24 respectively and their corresponding percentile would be somewhere between 45-50 percentile and 40-45 percentile. 

This is just a rough calculation and as I mentioned earlier, the cut off depends upon various factors. So the cut-off may vary a little. 

Instead of thinking about cut off study hard and try to get more marks in the April exam of JEE Mains. It will help you in getting a college and branch of your choice. 

All the best.