CAT level DILR sets

go for different sets available in the YT like the IMS Prayagraj YT DILR playlist if you want to go topic wise. ACE CAT 100 Series, 200 DILR sets by Anastasis Academy and 400+ sets by Aptitude Jab playlist. All of these are enough to get you the idea of how CAT level DILR sets come. Rest you can explore more in the YT as per your comfortability.

catlab.in, catmock.com these 2 are really good websites

Pyqs

pyqs should be your first priority if you really want proper cat level sets