Sir , i had done my class 12 first time in 2016 and then again in 2018,means twice from same board and same subjects .

Hello Aaaku
Yes, you can give the jee mains exam. The eligibility for jee mains are as follows:-

• Candidates must have passed class XII or qualifying exam in 2017 or 2018. Candidates appearing in class XII or equivalent qualifying exam in 2019 can also apply for JEE Main.

• It is mandatory for candidates to have taken 5 subjects in class XII or equivalent qualifying exam

The 5 subjects for B.Tech/ B.E. are:

1-Language, 2-Physics, 3-Mathematics, 4-Any one of (Chemistry, Biology, Biotechnology, Technical Vocational Subject), 5-Any other subjects

The 5 subjects for B.Arch/ B.Planning are:

1-Language, 2-Physics, 3-Mathematics (compulsory), 4-Any one of (Chemistry, Biology, Biotechnology, Technical Vocational Subject), 5-Any other subjects

Hope it helped you

thank you