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Answering questions correctly makes all the difference. Here are some model questions and answers collected from previous papers and their mark schemes.
4.1 Sense Organs
The Eye
(Given with graph)
Describe and explain how the distribution of the rod cells and cone cells relates to variation in sensitivity and visual acuity in different parts of the retina
(BY04 June 96 [...]

The gut or alimentary canal can be considered as an extension or inversion of the epithelium or outer skin, as it is physiologically not part of the body. It runs from the mouth from the rectum, and varies in thickness. It has the following functions (comments in brackets for my Yorkshire-born counterparts):

Ingestion (eetin’ an’ swallowin’ [...]

Presented with raw potato how would you carry out an experiment to determine the concentration of the potato cell in molar strength?
The experiment was set up to be as fair as possible. Then the potato chips were cut into 15 cylinders using a cork cutter and then cut to a length of exactly 4cm [...]