HI Upgray...I would say study the Instacert material. From the postings I have read, majority of people have passed using InstaCert only. I didn't use InstaCert and used only the Peterson's questions and I missed the test by one. I was shocked because it was my first and only failure and the test seemed fairly easy with the exception of the programing questions. After that I've used only InstaCert and am waiting the Dantes results from my last test. Good Luck!!
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