Its good for you to get used to use a calculator ASAP.
Most of students use TI-84+ CE or TI-nspire CAS. IB schools don’t allow CAS calculators but in American schools, a type of a calculator you guys have to use is pretty flexible and up to your own preference. I prefer using Ti-84+ to using Ti-nspire CAS.
I guess the best way to get a right one is to ask to one of your seniors in school.