Hello Amit ,
You need to choose one career as a option either Engineering or Medical else it would be very difficult for you to manage both of them  .

There is no age limit to be eligible for JEE Main 2020. However, candidates need to pass 10+2 or the equivalent examination in 2018 or 2019. Candidates appearing for 10+2 or equivalent exam in 2020 are also eligible to apply irrespective of their age.
Hope it helps and all the best for your future endeavors .

Hello,

Jee eligibility criteria :
Qualifying exam
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.
Subjects/subject combination
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.

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

I hope this helps.

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