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From this year onwards UPSEE is cancelled and it will be replaced by  JEE Mains, hence its scores will be further taken into consideration admission process, visit our  page at https://news.careers360.com/upsee-be-scrapped-from-2021-jee-main-scores-be-used-for-admissions to confirm the same, and as per the eligibility criteria of JEE Mains, though there is no upper age limit but talking about this year for example only candidates who have completed their 12th exam in 2019, 2020 or appearing for this year are eligible, hence if you have completed your bsc then you have already passed your 12th, and as per the rules you cannot appear for the same, to know about JEE Mains eligibility criteria, visit at https://engineering.careers360.com/articles/jee-main-eligibility-criteria