Hello aspirant!
Hope you are doing well!
For the JEE2020, HRD minister Ramesh Pokhriyal ‘Nishank’ on July 23 has announced to get admission into NITs and CFTIs, JEE Main qualified candidates are now just required to obtain a passing certificate in class 12th examinations irrespective of marks secured. relaxation in the JEE Main 2020 eligibility criteria for NITs and CFTIs .

For year 2021, JEE Mains2021, the eligibility criteria tends to be

• Candidates should have passed class 12 or qualifying the exam in 2019 or 2020.

• Candidates appearing in class 12 or equivalent qualifying exam in 2021 can also apply for JEE Main.
  
  Subject combination-
  
  

  • Should have passed qualifying examination (for B.Tech)

    • Physics

    • Mathematics

    • Any one of (Chemistry, Biology, Biotechnology, Technical Vocational Subject),

For more information refer to https://engineering.careers360.com/articles/jee-main-eligibility-criteria

For NIT or IIT the minimum eligibility criteria is you must have 75% marks in your boards exam.

For more info's you can visit the below mentioned link:

https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria

I hope my answer helps you. All the very best for your future endeavors!