A lot of students I've talked to have sworn that reading business publications in the weeks before the test was helpful, if you don't already do that. I think the Wall Street Journal, the Economist, and the Financial Times are all good choices. This has the added benefit of helping your reading speed and comprehension. In addition, brainstorming some examples from history that could be used to support many different points could be helpful. That way, you could go into the test with a short-list of examples that you would then bend to suit your essay. For instance, you might choose a war, a financial crash, a major business innovation, etc., and go into the test knowing enough about each of them that you could use them to support many different ideas.
