School Exams: Can we help them?

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Students fear exams because they do not know what would be asked, and they're not prepared for it. I was just wondering, if you were the invigilator of the examination, and you're also teaching the same subject, how much would you assist him especially if he's weak (whether in language or in the subject itself)? Well, you can't help him with the answers, of course. I'm asking this question because often, we have been warned not to communicate with students in the exam hall but are there any exceptions? Share your experience.