The preparation for these exams really starts from the beginning, especially the practical testing. The oral and written exams have good study guides, but even then are comprise together of roughly 1,400 questions to study through. Thankfully, many are answerable using a little common sense based upon what we've been taught, but there are many that just have to be memorized.
O&P day consisted of the oral exam starting at 0700 with the practical following immediately after. The practical consisted of roughly 14 different projects I was to complete to FAA standards, and with a 15 min lunch in the middle of the testing I finished at 1500 that afternoon. Of the three phases, airframe has the most information to learn, so it's nice to be on to the powerplant phase where we'll be disassembling and reassembling an aircraft engine. Only a few more months!