Yes, you can if you follow eligibility criteria:- Candidates should be pass in class 12 or qualifying exam in 2017 or 2018. The candidate appeared in 2019 also can apply. There is no age limit. The 5 subjects in class 12 which comprises of exactly a Language, Physics, Mathematics, any one of Chemistry, Biology, Biotechnology, Technical Vocational Subject and lastly any other subject. You can appear for 3 consecutive years in JEE Main.