Well Influences on Marketing is straight from the syllabus so
Influences on marketing
• Factors influencing consumer choice – Psychological, Sociocultural, Economic, Government
• Consumer laws
- Deceptive and misleading advertising
- Price discrimination
- Implied conditions
- Warranties
• Ethical – truth, accuracy and good taste in advertising, products that may damage health, engaging in fair competition, sugging
Maybe also study the role of marketing if you have not yet, as it provides some back knowledge that will be helpful
As for how to approach the exam... go through and do some past extended response questions based around influences on marketing, which will allow you to put your knowledge to the test quite well. Rote the content and use your notes or the textbook. I also have notes uploaded in the business studies forum if you are interested in that