Stick to your time schedule
Students who get good grades dont only know their stuff, they time manage their exams too.
One of the biggest mistakes your teen can make is to spend more than the allocated time on one question and consequently run out of time on another. At the end of the day, what counts is the overall grade your teen gets for the subject. There arent any prizes for answering one question incredibly well when you fail to answer five other questions worth just as many marks. Your teen MUST plan their exam time, and stick to this schedule.