4. Be aware of the language in the questions, its designed to catch you out. Many questions I got wrong is because I misunderstood.
My exam had a question with clearly 2 correct answers when I could only pick one!! which one was correct? or if I got it correct ill never know! Other questions on CORS, mobile API and opsworks were a little confusing, i don't think they were covered in the course, but I could be wrong. However, they prove why you need general principles.
To Linux Academy. More mock exams are needed to extract and home in on knowledge and language. Sometimes its very difficult to realise what you don't know until it's framed in a question.