Carefully examine the questions, see clearly the requirements of the questions, be careful when doing the questions, and don't despise them because they are easy. Such students are mostly caused by good grades, cleverness but carelessness. Usually pay attention to remind him more and develop good habits. It is a good thing to praise him for daring to do difficult problems and doing well, but all exams pay great attention to basic questions and account for a lot. Just ask him to pay more attention when doing the problem. In fact, many smart students will make such mistakes.