Hi aspirant,
Sorry to inform you but you won't eligible for UCEED 2020. To be eligible for UCEED 2020, you should have passed class 12th exam either in 2019 or 2020. It doesn't matter whether you've repeated one subject or all the subject, what matters is the year you passed class 12th.
Read the eligibility criteria below:
http://www.uceed.iitb.ac.in/admissions.html
All the best
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