Assignment marks cooked

I have been waiting for my assignment results since February, i receive them and i don''t believe the marks i have received. There are rumours that students mark Assignments, i am studying Postgrad in Project Management and the Resource assignment was just poorly marked, it makes me question everything about this school... i used so many sources, the marker did not read, people that used only the study guides got higher marks. I was ready to register my MBA now this bull**** i cant take!!!!!!!!!!!!!!!!