Private tutoring is the most effective method of test-preparation. For those for whom this is an option, the individual attention, the scheduling flexibility, the comfort of studying in your own home (or wherever you deem "comfortable") provide an ideal learning environment. Unlike a group course a tutoring allows the teacher to focus all his or her instructions on specifically your needs, the strategies that work best for you, and the areas in which you need to focus.
Why choose Bell Curves for tutoring? What is the structure of a lesson?