If you have year gap between 10th and 12th due to circumstances, then too you are eligible However you must have bene appesring 12th in 2019 and must clear Jee Mains for eligibility.
And should be born before 1994 for eligibility.
Maximum 2 attempts allowed in consecutive years.

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

Joint Entrance Exam Advanced

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