Dear student,
A candidate is eligible for jee mains for three consecutive years. As in your case you gave the first time in 2019, then you can definitely give jee mains 2021. But remember that you are not eligible for jee advanced as Students can appear for jee advanced for 2 consecutive years.
The eligibility criteria says that to be eligible for JEE mains for BE /Btech the candidate must pass the 12thboard exam with Physics, mathematics and anyone of Chemistry or Biology or Biotechnology or Technical Vocational Subject.

Joint Entrance Examination (Main)

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