Theory practice can be done online at www.mylicence.sa.gov.au or www.raa.com.au. These sites have superb interactive Learners Theory Test sections for you to practice on. Take a test, then any questions that you get wrong look up in the Road Rules book to make sure that you understand the correct answer.
Another fun way to learn is to create a test for your parents from the Driver’s Handbook (about 20 questions). Also, let your parents create a test for you. I wonder who will know more!!