What does IQ measure? It's a test. Tests attempt to measure something real. Tests are approximations, not reality in themselves.
Grade inflation is a huge problem.
and exam cheating too.
And bumping up grades doesn't help either. - nice data set.
And the income from foreign students means that Uni's have a huge interest in allowing students to progress to next year.
You can argue about subjective stuff, but when the questions in subjects like maths are getting easier it's very obvious. CBA looking for a link but I can remember seeing articles where questions on today's higher level papers would have been on the lower level ones from yesteryear.