It sounds to me like you are very much on the right track. As long as the material is making sense to you, and you feel like you are learning what you need to learn to pass the exams--and taking good-quality practice exams like those from Transcender, MeasureUp, Self-Test Software, BeachFront Quizzer, or ITpracticetest.com is a good way to tell how you are doing--you need not worry about pursuing other methods. In fact, only classroom training and interactive web-based training where you get access to an instructor is "better" than CBT, and since both methods invariably cost more, if you don't need to make that jump, stay where you are.
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