Study Strategy
There is nothing out there to study other than the ETS manual and the AP French guide. I mainly used the manual. I went over the ETS practice questions for French, the pedagogy practice sections of ETS German and Spanish, and read the writing and speaking prompts for other languages as well to get an idea of what they might ask. I listened to French podcasts. I watched all 9 seasons of Fais pas ci, fais pas ça during my off time to tune my ear. Search YouTube for pedagogie de l'enseignement and listen while driving. I found some by Babylon.fr on YouTube to be very useful. One is "Du E-Learning au Mooc's, critères de choix et conditions de réussite", another is "Quels outils pour une formation efficace". I took notes on those on my laptop as I watched, and paid close attention to any spelling errors I made and new vocab related to pedagogy. If you switch your language input to French, it should underline spelling mistakes.
Testing Strategy
I did pass by a good margin. I lived in Paris for 10 years, studied modern languages in colleges and French literature (in French) in grad school and taught French as a T.A. at a university in the late 90's. I expected to breeze through this test, but it turned out to be the hardest content mastery test I've taken. I took two other subjects before this and they were not difficult. This one is really hard for several reasons. The culture questions were weird and obscure. I KNOW my culture. I can't repeat questions, but I should have studied obscure details about French TV, art, and Switzerland. I knew the TV and art answers, but I would have never thought they were relevant to the test. I use a French AZERTY keyboard, and the test center allowed me to switch the computer input default to that keyboard, but it failed in the writing section. I guess the writing section overrides it somehow. I had to use the standard QWERTY keyboard which was a pain because my fingers know AZERTY and then you have to stop every time you need an accent. For the lesson plan and English essay, I did my essay first and then spent all the remaining time on the lesson plan.
I didn't want the English essay hanging over my head because I knew I was going to linger on the lesson plan. Practice speaking with a partner if you can. I got 3 out of 6 possible for speaking. On the simulated conversation, I read the explanation of the conversation and was busy thinking about some ambiguity in the directions when the conversation started. I remember thinking, "What? I thought you were calling me?" so be prepared to roll with things. Somehow I got a 6 out of 6 on that one which I don't think I deserved. I am glad that I had a well-researched philosophy of pedagogy and knew all of that vocab in French. Look at issues in pedagogy today and practice writing about them in French. It took all of 5 hours. I finished my other content mastery tests in about an hour.