Hi,
As you have not mentioned it clearly I'm taking it that you've not cleared 75% in your 12th class. So in that case cbse allows a student to take up improvement exam, just one time in the year just next to the year you attended your 12th class. Now I would like to mention for being eligible to give jee advanced exam you must have 75% in your 12th class and must have cleared jee mains exam. The conducting authorities allow the student to give jee mains exam thrice and jee advanced twice. So if you are satisfy the above two conditions then only you can give JEE advanced in both 2020 and 2021.
I wish you all the best
Thank you

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