HUDDERSFIELD student Clare Harrisson was crowned Britain's cleverest pupil after passing her history A-level - with a 100% mark.
The Greenhead College student was left almost speechless after finding she had received the perfect grade in her favourite subject - in what could be the first of its kind in the country.
The 18-year-old, who lives near the school, also passed all five A-levels she sat with A grades, adding a German AS-level with the same mark.
Clare said: "I can't believe it. I'm in total shock. I expected to do quite well, but to pass all my exams with A grades and then get 100% in history is just amazing."
The top grade was achieved after Clare completed six modules - made up of six exams - she took over two years.
In that time she has not lost one mark answering questions relating to medieval history - from 1066 to 1600 - going over the times of Robin Hood and Tudor England.
Clare is overjoyed that her favourite character in history, William the Conquerer, has gained her a place in the history books.
"I never thought I would get my own little bit of history, " she said. "How many people can say that?"
Greenhead principal Martin Rostron, 50, said: "It is an exceptional performance. I can't remember a pupil getting 100% across the board for one subject.
"To match that with straight As in everything else is just amazing."
Claire Ellis, spokeswoman for AQA, the UK's largest A-level exam board, said Clare had achieved the virtually impossible. She added: "It is outstanding. I have never heard of anyone else doing the same before."
Clare also got A grades in maths, chemistry, theatre studies and general studies.
Now she is looking forward to celebrating.
She said: "I think I deserve a drink or two. To be honest, me and my friends will probably be celebrating for the next few days."
Passing exams with top marks is nothing new for Clare. She got nine As and two A* in her GCSEs two years ago.
She plans to take a gap year as a voluntary worker in Ecuador before going to Cambridge University.