Hello Student,

There is no such fix criteria of CGPA. But generally you have to take CGPA above 9.0, because very few students reach upto this level. But the main thing is that, you have to became topper in 1st year exams. And only becoming topper is not sufficient alone. There must be some vacant seat in ECE branch after 1st year. If you have both these things, then surely you can upgrade your branch from Civil to ECE. For more info you can check the sliding procedure on the official website of MNNIT Allahabad.

Hope this helps.