Texas Instruments has been, and continues to be the leader when it comes to multi-functional calculators.
When compared to the older model TI-83, the TI-84 Plus graphing calculator has three times the memory, more than double the processing speedt and a higher contrast screen.
To make it even better, the TI 84 Plus is keystroke to keystroke compatible with the older model too. That means if you are familiar with the older model, then your are already familiar with this one too.
Just like its predecessor, you can use model on the PSAT, SAT, and ACT college entrance exams and AP tests. When coupled with the optional TI Presentation Link adapter it can be use for the IB exam too.

TI-84 Plus