Minerva was quickly recognized as the most outstanding student of her year, with a particular talent for Transfiguration. Minerva's school career overlapped by two years with that of Pomona Sprout, and the two students enjoyed an excellent relationship both then, and in later years.
In her third year, Minerva chose her elective subjects. One of these may have been Study of Ancient Runes, as she could understand runes in later life. It is highly unlikely that she chose Divination as the other as she showed great contempt for the subject in her later life.
By the end of the 1953-1954 school year, her seventh and last year at the school, Minerva had achieved an impressive record: she achieved top grades in her O.W.L. and N.E.W.T. examinations, she had been both a Prefect and a Head Girl, and won the Transfiguration Today Most Promising Newcomer award. Having learned Transfiguration from Professor Albus Dumbledore, Minerva became, under his guidance, an Animagus an ability that was duly recorded in the Animagus Registry at the Ministry of Magic. Minerva also played for Gryffindor Quidditch team in her student years; a nasty fall in her final year (a foul during the Gryffindor versus Slytherin match which would decide the Quidditch Cup winner) left her with a concussion, several broken ribs and a lifelong desire to see Slytherin crushed on the Quidditch pitch.
After graduating from Hogwarts, Minerva was offered a position at the Department of Magical Law Enforcement of the Ministry of Magic. She returned to her family's manse to spend one last summer with her family before moving into London.
During these months Minerva, aged eighteen, met Dougal McGregor a local Muggle who was the handsome, clever and funny son of a local farmer. Minerva fell head-over-heels in love with McGregor. The two got to know each other, and eventually McGregor proposed to Minerva on a ploughed field and she accepted. That night, she was unable to tell her parents of her engagement. Thinking about her future, Minerva realised that wedding a Muggle who was oblivious to the fact that she was a witch would mean she would follow her mother's footsteps and live unhappily with her wand locked away, shredding all of her ambitions. Early next morning, Minerva went to tell McGregor she had changed her mind, and could not marry him. Aware that if she broke the International Statute of Secrecy she would lose the job at the Ministry for which she was giving him up, she could give him no good reason for her change of heart. She left McGregor devastated and left for London three days later.