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In the Netherlands in high school I also had to have either a Casio or TI calculator.

For simple maths a normal calculator is good enough, but you need a graphing calculator for more advanced math.

> programable calculators are already on the edge in some exams

Flashback to 2 decades ago where I'd scan and OCR large parts of text then copied them onto my Casio calculator over the serial port it had (on a mini jack even, IIRC). Didn't have a lot of memory, but enough, especially after doing simple find/replace operations like replacing all 'the' with 't', 'and' with 'a' and so on.

> Most countries are not like US, it can be any calculator.

In my experience it's either been "no device at all", or "any calculator, but really only any calculator from this list".

I study in India and we are required to use a casio calculator. The board that I study in is also used in multiple other countries and recommends only casio watches.