Hey rlange, Taking an exam in English is not easy at all!! I am a native portuguese speaker and even speaking english fluently for more than 3 years, I still think it is tough. My biggest challenge is being calm and very concentrated when taking the exam. This is the first non-portuguese exam in my life, I’ll be VERY happy if I pass. Good luck!!
I think there is a definitely a selection bias. There must be at least 50k examers out there. If each one of them came to this forum, this forum would be unreadable. People who will most likely fail are ones who did not prepare enough. And researching CFA topics is definitely one way to prepare yourself.