This calculator got me through college. I then passed it down to my brother and it lasted him through college also.
The TI 80 series were more popular in my college days, perhaps these Casio's were more popular in another time or region?
The fx-9750 would have been usable at secondary school (though it's more powerful than what you really need), but it wasn't on my university's allowed list.
[1] Currently you can use an fx 991, fx 115, or fx 570 for CS, and I pretty sure the list was the same whilst I was there - https://www.cst.cam.ac.uk/teaching/exams/calculators