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Marty Weiss asked why HS class rank is high on the list of predictors for
college success but HS GPA is not high. He asks why they do not go
together.
Actually, they clearly do not go together because grade inflation, although
rampant, is not uniform. This means a person with a 3.8 GPA at one high
school could be considerably less motivated than a person with a 3.6 GPA at
another school. Literally, we see some students with 3.6 or 3.7 who are one
of the top five in a class of 300 at a school with lower grade inflation,
and we see students with 3.90 who are not in the top 10% of students of a
class of 300. The top students at the higher-inflation school all had GPA
of 4.0, 3.98, etc. such that by the time you get down to 3.90 you already
have 30 students above you. Grade inflation is that bad.