Excellent Preparation!!! I recommend Marvin’s study materials for anyone who wants to write the Masters Exam! In hindsight, I wish I had his material to study for my C of Q! I took the Masters Pre-Exam course with Marvin. I followed his instructions and used his material which helped me learn the OESC from cover to cover. His practice tests and questions prepared me well for what to expect on the exam and helped me understand how to use the Master Electrician Exam Acts, Bills and Regulations book.