The cutoff for SC/ST category for JEE Main 2017 was about 32 marks. And you scored 105 which is way higher than that.

Yes you will definitely get CSE or IT at DTU/NSIT/IIIT Delhi if you are a Delhi state person (ie completed schooling in Delhi).

You can also get similar branches in your state’s NIT. But you will get Civil/Mechanical at the most in other state’s top level NITs.

For example, if you are from Karnataka, you can get CSE/IT at NIT Surathkal, but will get Civil or Mechanical at the most at NIT Trichy or Warangal, all 3 of which are top level NITs. You can get similar courses at NIT Allahabad, which is a good level NIT. You can also get such courses at NIT Delhi or Kurukshetra or Jaipur, which are slightly low level NITs.

Hope this helps.

Best of luck!!!