Can Teacher do like this??????????????

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My brother joined 1st P.U (11th) this year.He just entered his first class of Accounts 5 minutes late......... here begins his trouble, for one year account's lecturer does not allowed him to enterd the class. he has got 96% attandence in all subjects and 0% in accounts. any how he studied the subject and wrote his final exam.. now waiting for a results......asking himself what is my mistake.Is going 5 minutelate for a class is a big offence? or this is the personal revange with a 1st p.u boy ??? (If U think my brother have did someting wrong , for ur information that was the day he stepd in to the college for first time)