I find it wild that US HS classes seem to demand specific calculators at all, let alone graphing calculators which can do a bit too much of the work for you IMO (for education purposes obviously). In HS we used the class set of TI-83s for like 1 week to easily play around graphing some functions something that could probably be done on most student's phones with a free app these days.

My HS classes let you use a scientific calculator but I think honestly that's a bit too much too for most purposes. In university we were almost never allowed a calculator for the exam on tests and questions were just designed to be doable without one which is a much better test of how well you know concepts than how well you know your TI.