If you report the situation to the invigilator before the exam bell rings and ask for a solution, there should be no problem. I believe your brother will report to the teacher in time to solve the problem. If the exam bell rings and the teacher is told to correct the paper after starting to answer the questions, then this time is wasted by the candidates themselves and will not extend the answer time of the candidates. Well, the college entrance examination feels much stricter this year, at least in Hunan Province. I think you can go to the relevant websites of educational institutions in various provinces to learn more details, and if there is any change, it should be announced.