Hello,
As 2019 was your first attempt for Jee mains and advanced and you missed it. Do in 2021 you can appear for both Jee mains as well as Jee advanced. But in the year 2021 you can appear for Jee mains and this will be your last chance at Jee Mains. And for Jee advanced, 2020 will be your last attempt. You cannot appear for Jee advanced after that.
Hope it helps

Hello student I'm sorry to inform you but as of now from the NTA guidelines you can attempt JEE Advance only 2 times no matter if you attempt it with your class 12 boards or not but you've only one chance now and that's this year 2020 jee advance. You can attempt JEE main in 2021 but not jee advance.

You can also click on the link mentioned below for more information about JEE.
https://engineering.careers360.com/exams/jee-main

Feel free to comment if you have any doubt
Good luck

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