I'm not giving away any secrets, but after 22 years of doing, setting and marking exams I can tell you there are some sensible "do and don't"s for doing exams in business courses. So here's what I had been saying to students in my two courses. The five points are more or less the same for both.
What I said in Management of Brands
What I said in Consumer Behaviour
Simply, just don't make it hard for the marker to give you the marks you deserve.