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.