How to get admission in DTU

Focus more on your rank than on your jee mains score.Because due to normalization now a lot of it also depends on your +2 percentile, rather most of it. A score as low as 160 can also get you a rank around 7k (with a jee rank like this you can get into any stream you want to, except for COE), provided you score exceptionally well in your 12th grade.
As far as placements are concerned, after IIT-D, NSIT and DTU are the best you have got in Delhi (acc to me). A lot of tech and non tech companies visit these colleges every year, offering you decent packages.