Dear aspirant,

99.93 is an excellent percentile and with this you have a really good chance of getting any NIT of your choice. You can get NIT-Trichy CSE, IIITH-CSE as well. However, it is difficult to predict the score as it depends on

1. The difficulty level of the paper

2. The number of students attempting the exam

Based on predictions we can say that you'll need atleast 285+ marks to achieve the percentile.

Hope this helps.

Check out the link below for more predictions.

Percentile