Stoke Park champions have been in training in and out of school for several months. Top scorer Louise Harwood, 15, told CBBC Newsround Online: "We do get to do bowling for PE sometimes, about every two weeks."
Another of the team's top players, Kyle Kavanagh, 14, has been tenpin bowling since he was just four-years-old. He said: "To be good you've got to practise. I practise every day!"
Ten secondary schools made it to the finals, which took place on Thursday at Bexleyheath Megabowl.
Winner takes cash share
The winning school, along with two runners up, won a share of £7,000 cash to spend on school.