Yes, you will be supplied with a calculator.
I think this exam is one of the easier ones as it doesnt require the casa engrish pre requisite.
If you know the calculation from the Bob Tait books you shouldnt have a problem.
Bring a sharp pencil and a sharpener and keep it sharp when using the graphs/charts in the day vfr booklet for exams especially on the performance charts fig. 4 and 5 as sometimes the width of the pencil can determine a different answer
3 questions wrong equated to 90%
Good Luck