Write Passed. I had the same problem. So I asked on the JEE MAIN website. Here is a screenshot

Mail from jee for improvement student I personally mailed them

Dear Candidate,

The aspiring Candidates of JEE(Main)-2020 are advised to choose the option “ Passed ” in the section educational details for class 12 th or equivalent if they are already appeared for class 12 th or equivalent examination.

However if the Candidates has applied for improvement in one or more subject(s) the verification of the documents for Admission to    IITs, NITs, IIITs, CFTIs, SFIs, State Engineering Colleges for Participating States and Other Participating Institutions, will be done by the counselling body.

Regards,

JEE, UNIT NTA

Hello student you need to fill the form as a appearing candidate so choose appearing in that section.
NITs/ IIITs/ GFTIs Admission: Candidates should have obtained a minimum of 75% marks in class 12 or equivalent exam or they must be in the top 20 percentile in their class 12 examination. For SC/ ST, the eligibility is to obtain a minimum of 65% marks in class 12 or equivalent.

Feel free to comment if you have any doubt
Good luck

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