Other forms: savants
You know that girl in your school with a 4.0 GPA? 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 sapere, "to be wise." In English, a savant can be someone is who is wise and learned in general, or someone who is extremely skilled in a particular area, like your little brother who can rattle off the first three hundred digits of pi.