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You have to be in the top 20 with respect to your entrance exam.

What if someone switches their UNI during vacancies and still remain in the top 20, would they get ABS ?
It’s unlikely you’ll be in the top 20 if you got the university through vacancies, right? Unless you’re shifting to a lower ranked NLU
Well it can be the case that OP filled the wrong uni at wrong place. Someone in my uni filled NLIU over NLUJ and they came in vacancy.