Calculator skills playlist
Alternatively, head over to Using your calculator to search for a function.
Recommended calculator for GCSE
CASIO FX-85 GTX is the recommended calculator for GCSE Maths this year.
Casio have recently issued a new calculator design, -CW, which is replacing the model above. I do not recommend buying this type, as you are more familiar with the older version, and learning a new set of skills this close to an exam is generally a bad idea!