Hii

The Eligibility for Jee Mains is as follows;
Date of Birth-

• For General Category- On or after October 1, 1994 
• For  SC/ST, PWD category- relaxation of 5 years

Year of Passing Qualifying Exam

• Candidates who appeared for the exam on or before 2016 will not be considered eligible.
• Those appearing after 2020 will not be eligible as well.
• Candidates passing after 2016 or appearing in the year 2019 can appear for JEE Main 2019.

Number of Subjects in Qualifying Exam

• It is mandatory for a candidate aspiring to take JEE MAINS 2019 to pass the qualifying exam with 5 subjects in total.
• If 4 subjects are taken in the exam, the candidature will not be considered valid.

Score Required in Qualifying Exam

• For general category candidates- minimum  75% marks in aggregate.
• For SC/ST/PWD candidates-  65% marks in aggregate. 

Total Number of Attempts

• Candidate can appear for up to 3 times for the Joint Entrance Exam.
• There is no relaxation for candidates belonging to reserved category.

Eligibility for Class 12 Droppers

• The eligibility conditions for year droppers does not vary, however, they must fall under the age category of 24 years.
• There is no relaxation in terms of marks required in class 12 exams. Candidates must have obtained 75% marks in 5 subjects.

Hope this helps
Thanks!!