Hi Anku,
No, you won't be eligible for JEE Advanced 2020. The rule is you can give JEE Advanced only twice, that too in consecutive years, the first being the year you pass your class 12th.
However, you can give JEE Main. The rules for JEE Main is that you can give it thrice, in consecutive years. The first being the year you pass your class 12th.
All the best
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