For WJEC exam board.The Friday paper will most likely ask for a chi squared calculation, t-test calculation or standard deviation calculation (but I believe they give you the formula it is just good to practise so you know you have it down) and then an interpretation of the calculations you have completed. Then also a microscopy question which will likely involve identification, but may also involve a magnification calculation if you haven't already been asked to carry out a calculation. So DATA INTERPRETATION, a CALCULATION and labelling from a light (i think it's light but it may also be an electron) MICROGRAPH. (lists of which micrographs could come up should be available on the wjec website)