JEE Main

1. IIT Madras
2. IIT Bombay
3. IIT Delhi
4. IIT Kharagpur
5. IIT Kanpur
6. IIT Roorkee
7. IIT Guwahati
8. Anna University, Chennai
9. IIT Hyderabad
10. ICT Mumbai
11. NIT Tiruchirappalli
12. Jadavpur University, Kolkata
13. IIT (Indian School of Mines) Dhanbad
14. IIT Indore
15. NIT Rourkela
16. VIT Vellore
17. BITS Pilani
18. IIT Bhubaneswar
19. IIT (Banaras Hindu University) Varanasi
20. Thapar Institute of Engineering and Technology Patiala
21. NIT Surathkal
22. IIT Ropar
23. IIST Thiruvananthapuram
24. IIT Patna
25. NIT Warangal
26. Birla Institute of Technology, Ranchi
27. IIT Gandhinagar
28. IIT Mandi
29. PSG College of Technology Coimbatore
30. IIEST Shibpur
31. VNIT Nagpur
32. Jamia Millia Islamia, New Delhi
33. SASTRA, Thanjavur
34. Amity University, Gautam Budh Nagar
35. Aligarh Muslim University, Aligarh
36. Sri Sivasubramaniya Nadar College of Engineering, Kancheepuram
37. Sathyabama Institute of Science and Technology, Chennai
38. IIIT Hyderabad
39. Manipal Institute of Technology, Manipal
40. Thiagarajar College of Engineering, Madurai
41. Delhi Technological University, New Delhi
42. Jawaharlal Nehru Technological University, Hyderabad
43. NIT Kurukshetra
44. National Institute of Industrial Engineering, Mumbai
45. College of Engineering, Pune
46. SRM Institute of Science and Technology, Chennai
47. NIT Durgapur
48. MNNIT Allahabad
49. Koneru Lakshmaiah Education Foundation, Vaddeswaram
50. NIT Calicut
This is the list of top 50 colleges on the basis of placement.

It is difficult but not impossible. Read the full answer it is detailed but getting admission during counseling rounds also depends on your caste and rank. See the last year cutoffs for various branches at NSIT. See can your rank get admission according to cutoff of last year. If you don't get NSIT don't get sad try for other good Colleges in Delhi. Fill the JoSSA form for counseling rounds. Fill the order of Colleges properly during form filling. Definitely you will get other good colleges if not NSIT. Take out the list of colleges and see there cutoffs. This helps a lot. Refer the link below for cutoffs of NSIT of all branch.
Lowest closing ranks is 22-23K. Highest closing rank is for CSE that near about 4300-4500. There are various rounds held play them carefully. Sometimes you get a seat in last or last second round so you have to patient. Good Luck!!

Hi Vaibhav,
First of all, you must have either a national rank below 30K or Uttrakhand domicile for GBPUAT because 85% of the total seats are reserved for Uttrakhand candidates, so to secure a seat a domicile is must . Apart from it, you can apply online for counselling, it's usually held by the end of July on the basis of your state rank (if you have a domicile) and the preferences filled you'll get a branch there are 2 online counselling rounds. After each round candidate are asked to report, if one fails to do so the seat is considered to be empty, however, there is a special 3rd round which is offline . It is known as spot round everyone has to report at the university along with their JEE Mains Paper 1 rank, according to your ranks you'll get a branch.
Best of luck.