What do you think will come up for the theroms? IVE heard Pythagoras is meant to, and I know that so is there any point learning the rest?
The parallelogram one (9) or the measure of an angle at the centre of a circle (19) may also come up.
The worst thing would be to study only one and it not come up
the circle theorem wont come up, because it came up last year
parallelogram is most favourite