Isabelle is correct, but you should also take note of the official description of calculators permitted in AAT exams;
"Calculators must not be programmable. Calculators should not be able to store data, text or alphanumeric formulas. Calculators should not emit audible tones, be able to print, be programmable from other sources or be a function of a personal organiser, watch or mobile phone. Solar powered calculators are used at the student’s own risk."
Source: Supervisors Instructions for AAT computer based assessments (CBA), August 2014.