[xyzzyz]

That’s the theory; in practice hardly anyone does IQ tests, while employers asking for GPA is an extremely common occurrence. What matters for them is not what is legal, but how likely something is going to cause you legal problems.

[joeax]

I was once asked to take an IQ test for a software developer job. I believe it was more of a formality, and they wouldn't tell us our score. I'm not sure it was legal or not, and I was glad to do it.

That being said, in my 20-year career I've never been asked for my GPA. Not once.