The reason behind her behaviour was because she had been bullied by other students when she was in an intermediate school.
Is it correct?
anonymous The reason behind her behaviour was that she had been bullied by other students when she was in the middle school/in the intermediate grades .
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anonymousThe reason behind her behaviour was that she had been bullied by other students when she was in the middle school/in the intermediate grades.
anonymousThe reason behind her behaviour
This would be more natural with for instead.