"Học sinh này phải khắc phục sự lười biếng của mình."
Translation:This student has to overcome her laziness.
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"This student can be male or female because there is nothing in the sentence make the gender of the student clear."
"They" can used in English when you don't know whether a someone is male or female. In this sentence, "their" would be much more natural than "his" or "her" if there is one student and you don't know if they're a "he" or a "she".