Hey Ayush, The eligibility criteria for applying for CCMN(Centralised Counselling for Admissions in NITs and CFTIs) are as following:

• Candidates must have cleared JAM.
  
• Category candidates must have their category certificates in hands while attending CCMN.
• Candidates must secure 60%(general) and 55%(SC/ST/PWD) in their qualifying Degree Exam.
  
• Candidates must make sure to fulfil the age limit mentioned.

Registration for CCMN will start from Last week of April 2019.

Hope this helps.

You can check the link below for more information about CCMN:

https://university.careers360.com/articles/ccmn