> Students able to get into any top school will likely all easily achieve full score on an ordinary tests. The professors at top schools need to make these tests brutally hard in order to produce a bell curve.

This is no longer how “high pedigree” schools function in the US. There is too much blowback from helicopter parents and the kids who haven’t ever had to deal with critical feedback before.

Lookup “grade inflation” if you want to be horrified by the quality decline of “pedigree education”.