Consider an academy of magic with the following seven disciplines. Disciplines are equivalent to general majors. I have taken help from existing D&D concepts; this video about the different schools of magic in D&D was instrumental to me bringing structure to ideas I have played with for a long time.
Magical Disciplines Wardcraft shielding negating a spell reflecting a spell pocket building (with metamancy and others) Kinesomatics advanced physical capabilities heightened senses perfect weapon control agility endurance bodily enhancements, such as growing wings, claws, etc (in combination with metamancy for inorganic materials, or lifecraft for organic additions) Klesiurgy summoning objects summoning living beings teleportation telekinesis weather control (in combination with energetics) flying spying (in combination with mindcraft) Metamancy transmutation of objects alchemy potions controlling marionettes (in combination with lifecraft) earth-based elementalism Energetics weather control (in combination with klesiurgy) fire and water elementalism and related forms like smoke and ice thunderstrike explosions darkness heat and cold gravity manipulation (in combination with wardcraft) Mindcraft illusions, visual and auditory persuasion calming and agitating confusion memory loss memory manipulation telepathy Lifecraft healing taming birds, beasts, fish tending plants imbuing lifelike properties to mechanical objects, controlling marionettes (in combination with metamancy) instant death curse contracts Academic Structure Candidacy requires high mental and physical abilities along with proficiency in languages and mathematics. Candidates would typically rank in the top 0.1 percentile in mundanes’ college entrance examinations. Time at the academy is divided into three non-equal phases. All seven disciplines are taught in the first phase. There are additional lessons in mathematics and languages beyond those taught in these disciplines. Candidates study four disciplines in the second phase. Candidates study one or two disciplines in the third phase. There are exams at the end of the first and second phases, and a capstone project at the end of the third. The candidates’ third phase disciplines are their majors. The other second phase disciplines are their minors. Typically, it’s one major three minors, or two major two minors.