Without a calculator, it's almost impossible to calculate difficult equations. With the Casio FX-9860GII, however, this isn't a problem. Creating graphs and calculating difficult formulas becomes a breeze with this calculator. In addition, this calculator has background lighting. The display of the Casio FX-9860GII is always easy to read. In addition, this Casio has OS 2.07 with exam setting, and it's been approved by the College van Examens for HAVO and VWO final exams.