Hello student if you were absent then no matter still you need to fill the application form as appeared for Jee main as its just to collect information from your previous application/form. In case if you've filled the application form as a fresh candidate still no need to worry.
Application for jee main April examination starts from 07th of February and shall remain open till 07th of March 2020.
You should fill the application form with the pink right side window which is for student who've registered/appeared for Jee Main January examination.
Refer to the link mentioned below
https://testservices.nic.in/ExamSys/root/applyfor.aspx
Feel free to comment if you have any doubt
Good luck

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