Known achievements of O.W.L.s

Astronomy o protect magical creatures o curse o defend against dark magic e arithmetic divination o herbalism o magic history o potions o transfiguration o ancient magic writing o.

In addition, according to the records in the book, the eldest brother Bill and the third Percy of the Weasleys have twelve owl certificates (even worse than Hermione, unbelievable! ), and there are only three clown twins whose main grades are outside the academic field. They also joked that they had at least an E in every subject because they had exceeded expectations when they came to the exam. Ron Weasley didn't get "excellent" grades, but O.W.L.s passed seven courses, and failed the course of magic history and divination.