More advice from others:
1. Try to focus more on holding the conversation confidently with the examiner. Which also means concentrate less on thinking is the answer right or wrong.
2. When going for COC 5, the prior experience is just Engine Cadet so the amount of knowledge and experience will naturally be limited. When answering, it’s good enough when the definition more or less is correct. Holding conversation is slightly harder.
3. The examiner may start the oral exam by asking for a short self-introduction, so prepare a professional self-introduction in advance.