Don't second-guess the examiners. Revise all parts of the course; not just the things that "usually come up". One year neither sexual selection nor speciation came up on the BIOL2007 exam. Many people were caught out.
1) Think for a minute or two about the question.
2) Answer the question!!
a) Write out a rough plan
b) Think about the plan, add things.
c) When you have collected your thoughts, write the essay.
d) Make sure it is actually an essay, not a series of garbled notes (unless you are very pressed for time -- but try to avoid that!). Pay attention to grammar, punctuation and spelling!
e) As a suitable structure for your essay: how about an introduction/definition section, a development section, and then a conclusion which expresses your view of the state of the field?
Go to: FAQ
Grade an exam yourself! See real student answers.
What did BIOL2007 students think of sexual selection in humans?