Which is the best research institute of computer science in India and in the world ?How you can join it ?

I will here tell you about best institutions of Computer science in india.They are listed aa:

RANKCOLLEGE NAMECITY/STATEAVG SALARY(Rs.)
1IITDelhi16.45
2IITKanpur16.2
3IITMumbai16
4IITKharagpur15.87
5IITChennai15.8
6IIITHyderabad15.53
7IT- BHUVaranasi<15.37
8IITGuwahati15.25
9BITSPilani15.1
10Delhi Technological University (DTU)Delhi15
11College of Engineering (COE)Pune14.91
12Bengal Engineering & Science University (BESU)Shibpur14.72
13NITWarangal14.38
14NITSurathkal14.25
15VJTIMumbai14.16
16MANITBhopal14.1
17BITMesra13.72
18ICFAI UniversityDenhradun13.42
19Noida Institute of Engineering & TechnologyGreater Noida13.2
20ITM Group of InstitutionsGwalior13.1
21Institute of Technical Education & Research(ITER)Bhubaneswar13.02
22Accurate Institute of Management & TechnologyGreater Noida12.85
23Rungta College of Engineering & TechnologyBhilai12.76
24Bharati Vidhyapeeth Deemed UniversityPune12.63
25Siddaganga Institute of TechnologyTumkur12.55
26Harcourt Butler Technological Institute (HBTI)Kanpur12.39
27Heritage Institute of TechnlogyKolkata12.31
28Aditya Group of InstitutionsPeddapuram12.24
29Bheemanna Khandre Institute of Technology( Formerly REC)Bhalki12.17
30Sona College of TechnologySalem12.11
31RMK Engineering CollegeTiruvallur10.99
32IES College of TechnologyBhopal10.87
33Mahendra Engineering CollegeNamakkal10.7
34Sri Ramakrishna Engineering CollegeCoimbatore10.51
35Chadalawada Ramanamma Engineering CollegeTrupati10.48

If you talk only about grooming better coders and placements then my preferences would be like :

1. International Institute of Information Technology, Hyderabad - IIIT H ( Best performing college in ACM ICPC -- that tells it all )
2. Indian Institute of Technology,Kanpur - IIT K
3. Indian Institute of Technology,Powai - IIT B
4. Indian Institute of Technology,New Delhi - IIT D
5. Indian Institute of Technology,Chennai - IIT M (All top 5 are virtually same in every aspects)
6. Indian Institute of Information Technology,Allahabad - IIIT A
7. Delhi Technological University,New Delhi - DTU
8. Birla Institute of Technology and Sciences, Pilani campus - BITS Pilani
9. Motilal Nehru National Institute of Technology,Allahabad - MNNIT
10. Netaji Subhash Institute of Technology, New Delhi - NSIT
11. Indian Institute of Technology,Kharagpur - IIT KGP
12. Chennai Mathematical Institute,Chennai - CMI
13. Indian Institute of Technology,Roorkee - IIT R (Their Maths course is very good too. I have seen a lot of good coders who have done Mathematics and Computing here).
    National Institute of Technology,Tiruchilapalli - NIT T
14. Indian Institute of Technology,Varanasi - IIT BHU
15. Indian Institute of Technology,Hyderabad - IIT H
16. Indian Institute of Technology,Guwahati - IIT G
17. National Institute of Technology,Surathkal - NITK Surathkal
18. Indian Institute of Technology, Indore - IIT I
19. National Institute of Technology, Warangal - NIT W
20. Birla Institute of Technology, Mesra - BIT Mesra
21. Malviya National Institute of Technology, Jaipur - MNIT J
22. National Institute of Technology, Calicut - NIT C
23. Sardar Vallabh Bhai Patel National Institute of Technology,Surat - SVNIT
24. Indraprastha Institute of Information Technology, New Delhi - IIIT D
25. Anna Guindy University, Chennai
26. Jadavpur University, West Bengal
27. Viswesarya National Institute of Technology, Nagpur - VNIT
28. Maulana Azad National Institute of Technology, Bhopal - MANIT
29. Birla Institute of Technology and Sciences, Goa Campus - BITS Pilani Goa Campus
30. National Institute of Technology, Kurukshetra - NIT KKR

Most of these colleges gives the admissions through JEE mains and JEE advance ranks