Hello Sayon,
The admission criteria differs from college to college. Some Colleges require 50% overall with qualified marks in CEE and some asks for overall 60%. But most them ask for overall 60% only. So please don't score less than 50%, better keep it 60% to be in the safe side. Keeping your 12th percentage good will help in your placement as well.
Hopefully this helps and comment below for any more queries.
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