According to some of my friends studying at Dayanand Sagar, there are 2 options available if a student misses one interval in Dayanand Sagar College of Engineering.

1. The internal marks for an interval are considered as the best out of the 3. So there are chances to rectify the past mistake. Students who have missed an interval can attend the remaining 2 and score the required mark which is totally acceptable by the institute.
2. Contact the Head of Department and explain your situation. It’s up to him/her to make the decisions based on your reason. There’s no need to worry if you have a valid reason with supporting proofs and documents. In that case, they are very considerate.

The Head of Department can allow you to take the test later if they believe the reasons are genuine after viewing your case.