Is it random to pay a return visit to graduate students' mental health?

Postgraduates' mental health return visits are random. According to the relevant information, after the psychological evaluation of graduate students (within one month), some students will be randomly selected to participate in the evaluation return visit. The evaluation of graduate students' mental health is an evaluation of students' emotions, self-confidence and other related normalcy and personality, involving dynamic aspects such as emotions, and understanding whether students have some psychological obstacles and other issues.