dress posture eye-contact not fidgeting, tugging on clothes, or stumbling in shoes all are equally important There are nonverbal cues that are MORE important than those listed.but TUGGING ON CLOTHES
Maybe is rebellious or has a behavioural disorder - you should try not to provoke or annoy the classmate - maybe grab their attention and distract them or say something along the lines of maybe you shouldn't do that or maybe miss or sir will be angry at you for it
A wish to escape the world. With the lines "leave the world" and "fade away into...dim" he conveys that he wants to dissapear from the world.
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