My scores in DILR fluctuate a lot and I observed that my scores hit low when the test has 2-3 sets based purely on DI. Though at first it seem easy to me but they ten to consume a lot of time leaving me with not much time to solve other sets, and when I see the solutions,they usually solve it in a much shorter way.What should I do? and sometimes when my set selection is right, I am not able to crack the puzzle. and what is, this happens on the D-day?Quite tensed.

Hi
First of all it is unlikely that CAT will give 2-3 pure DI based sets, you might encounter this in sectionals just to make you practice of a particular topic but in CAT it is unlikely, so don't take the scores to your heart.
Now if you select a set and is not able to crack , you should not waste any time on that (the threshold is 5 minutes ) and immediately leave the set and move on to the next one .
If you don't have much choice , then try to go through the questions and see what is actually asked and sometimes questions help a lot , looking at options , cases possible etc. so refer to them as well .
But always try to pick the first set from your strength topic and try to solve first set correctly as that boosts a lot of confidence in the exam.

Thank you:)