I know that in first year, students took Charms, Transfiguration, Potions, DADA, Herbology, Astronomy, and History of Magic. But at the end of the year, when they took exams, what would happen if they failed to many? I remember Hermione mentioning that they needed to pass to continue at Hogwarts. Were they simply given a pass or fail, or were they graded like OWLs are? In sixth year, did they have exams or not?
Also, how many additional classes were they allowed to take in third year?
Any help would be really appriciated.