Regarding NCSU stats on secondary admission to major, there is some information, but not that easily findable:
Current and previous (no GPA distributions): https://www.engr.ncsu.edu/ir/coda-statistics/
December 2018 and earlier (with GPA distributions): https://ir.engr.ncsu.edu/coe-coda-statistics/
That they no longer report GPA distributions makes it more difficult to tell how competitive a given major is.