Read through the FAA practical test standards for this test. You can either buy the book or use the
www.faa.gov website. Look at the areas that will be covered in the test and read around them. Try to use the FAR/AIM for most of your background reading. This way, if you can't remember something in the oral, you can look it up in the said book. Get your instructor and other students to ask you questions based on the test standards.