Nicole Barr, 12, from Essex, scored an impressive 162 in the test, two points higher than both Hawking and Einstein.
Her parents say they are both proud of the schoolgirl, who is from the traveling community.
Mother Dolly Buckland, 34, said Barr was an extremely conscientious child who dreams of becoming a doctor.
“She’s a hard, hard working child. She stays after school for homework club and never misses a day.
“From a young age she’s been picking out mistakes in books and magazines. She’s a happy, fun-loving girl who is always asking for extra homework.