I am an international student, and I study in Pierce college. I have already finished my international program few quarters ago

But now the international advisor ask me to retake one reading class which I thought I am already passed it because my instructor told me I am passed and no one tell me I have to retake. But now, the International advisor ask me to retake it, she said I did not pass it. If I do not retake that class, she will drop all of my college this quarter immediately. I thought I felt Grievance¿ and I really angry about that.