savant

You know that girl in your school with a GPA over 100? She is a savant in the making. A savant is someone over-the-top smart, a scholar. It might take a savant only five minutes to do an entire math test.

Savant is the French word for "learned" and it goes back to the Latin word "to be wise", sapere. There are savants who are wise and learned, and then there are idiot savants, who are brilliant in very specific areas, but not in others, like an idiot savant who knows absolutely everything about the American Civil War but has no ability with learning a foreign language.

Definitions of savant
1

n someone who has been admitted to membership in a scholarly field

Synonyms:
initiate, learned person, pundit
Types:
polymath
a person of great and varied learning
Type of:
bookman, scholar, scholarly person, student
a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines

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