Assuming your query is related to NITs & IITs so for this year the top 20 percentile is not yet out but to get a rough idea you can go through the below previous year trend -

https://josaa.nic.in/webinfocms/Handler/FileHandler.ashx?i=File&ii=86&iii=Y

https://josaa.nic.in/webinfocms/Handler/FileHandler.ashx?i=File&ii=87&iii=Y

Good Luck!!!