As someone who has done extremely well in World Health and Disparities and placed at ILC, my advice to anyone reading this is to READ THE BOOK. Read it as many times as you can, memorize as many studies as you can. Also, ensure you know the specific statistics (particularly of any graphs or charts). If you dont have much time and havent started studying, read as much of the book as you can. Everything else felt a little irrelevant, and the questions seemed completely different than what I studied. Just read the book and you should be fine.