Hey there
As you are a dropper so it's a common question which comes in mind but the top 20 percentile will be of your passing year or your percentage should be more than 75 percent. So your top 20 percentile will be of 2019.
Check about JEE mains
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/exams/jee-main&ved=2ahUKEwjl9ozh3LnkAhWMv48KHYdVAOoQFjAAegQICBAB&usg=AOvVaw1k3rMyr-Osb0qy4gsPfOaR
Good luck

The top 20 percentile of 2019, that means your 12th passing year will be considered.
As per JEE main eligibility, Candidates must have secured at least 75% marks in 10+2 exam or be in the top 20 percentile in 10+2 conducted by the respective Board.For SC/ ST candidates, the qualifying marks in 10+2 are 65% or more.

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