Hello Satyam,
In case the admission process is already completed, it might be a serious problem. However, if the allocation on first list was wrong due to any technical error on part of UPSEE board, it can be corrected.
Sometimes, colleges give an extension date for re-selecting college preferences. You can get updates about such happenings here: https://upsee.nic.in/publicinfo/public/home.aspx
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