Unstability during higher education?

allaboutfaysalq
One of my girlfriend is unable to study during higher education classes whenever she opens up books she feels tired sleepy and irritated. She is unable to find the valid reason as to why only she is unable to study even her class mates are studying passionately and takes good marks etc. What should I suggest her to do or what will be expected problem of her related to her studies?
Unstability during higher education?
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