Here is a rough estimate of the score needed to secure a eat n DTU CSE.
Category |
OS |
HS |
General |
230–250 |
180–210 |
OBC |
180–210 |
100–130 |
SC/ST |
130–150 |
85–100 |
The above cutoff varies from year to year so you shouldn't solely rely on them. NTA conducts the JEE Mains so it's hard to predict rank by marks, percentile, etc.