Hello student yes it's mandatory to appear and qualify Jee main 2020 to appear in Jee advance 2020. As its a national level entrance examination for admission in top B.tech college. Each and every cut off vary on various factors like the level of question in the in the entrance examination and total number of applicants in that examination.
So 2019 Jee main are not valid anymore to appear in Jee advance 2020.
Eligibility - candidates must passed or appearing class 12 with physics chemistry and mathematics with minimum 75 percent marks aggregate from a recognized board
Application for jee main April examination starts from 07th of February and extended till 12th of March 2020.
Feel free to comment if you have any doubt
Good luck

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