Step-by-step explanation:
it would help him if he visualize himself studying really hard for the exam because one if he is actually thinking of scoring high marks the time he is wasting on doing that he is suppose to use that time to study really hard because when he is actually thinking of scoring high marks his expectation would become too high and before you know it he would be nervous when writing in the exam hall and when he becomes nervous he would actually make mistake so I suggest that visualizing himself studying really hard is the best