It is normal for the examiner to feel a little tired later, especially near dinner. In this case, generally speaking, candidates must be concise when answering, and must not be sloppy. At the same time, more eye contact with the examiner and proper eye contact can mobilize the examiner's mood and make him more focused.
Everything has advantages and disadvantages. Candidates at the back, while waiting, can turn over the books and continue to review. Note that what we are talking about here is a glance, a cursory look, not an intensive reading. You can also close your eyes properly and recall the interview questions you have reviewed.
When you go to the interview, you'd better prepare one or two chocolates to satisfy your hunger. Especially when tickets are issued in the morning 1 1 and after 4 pm, people often feel hungry and lose energy.