Joy Brewitt-Taylor, who went to Malvern College, is celebrating being awarded 45 points in her 2005 International Baccalaureate results, the maximum obtainable in the world.

This matches her brother Sam, who achieved exactly the same in 2003. The 18-year-old had initially been awarded 44 points when the IB results were announced last July, but this was revised upwards to the maximum of 45. These results are well above the threshold for Oxbridge entry by IB candidates, which is 39 points.

"It is astonishing for both a brother and sister to achieve the maximum points for the IB," says the college's headmaster Hugh Carson.

"The IB organisation has said it knows of no other brother and sister who have ever achieved this. Sam and Joy are to be heartily congratulated and so are those who taught them here."

Joy goes to Madagascar in January to teach and will join Selwyn College, Cambridge, to read economics later this year.

Sam is already at St Peter's College, Oxford, where he is reading modern history.

Sibling rivalry: Joy and Sam Brewitt-Taylor.