Hello Satyam,

With your marks, you can try for IIT ROPAR. For cutoffs of JAM for IIT, you can visit https://university.careers360.com/articles/iit-jam-opening-closing-rank

DU and NITs both are good in their own zone, but I would suggest you that go for NITs because in DU  lots of other events like election fest etc that will distract you. If you want to focus on your studies and really serious for your future and you want to do something good in your life then go for NITs.

Hope this information helped you.