Three local pupils have come top in the world in this year's International GCSE examinations. Connie Leung Hong-ni, 15, from Sha Tin College, scored the highest mark in co-ordinated sciences, the best mathematics student was Priscilla Poon Ka-yee, 15, from German Swiss International School, and Fiona Murray, 16, from Island School, came top in English literature. 'I thought they had made a big mistake,' Connie said. 'I didn't think I was the best. I thought there were lots were people who are better than me at school. 'There are lots of parts of science that I'm not especially good at.' Her results, however, tell a different story - she scored eight A* and two A grades. One might have expected Connie's parents to have been overjoyed by the news but she said they had a very understated response. 'They weren't too bothered, really. My mother didn't have any special reaction,' she said. Connie has now started studying for the International Baccalaureate which, she said, was 'hard, but fun'. 'It's fun because it's difficult,' she said. 'I deliberately chose subjects that were more difficult.' That included subjects such as physics and economics, which were her favourite classes. 'Not many girls pick physics,' she said. 'I think that's a shame because girls can actually be really good at it.' Teachers at her school said they were 'incredibly proud' of her achievement. 'All I can say is Connie's had an absolutely outstanding achievement,' said Neil Hodgson, head of science. 'What makes it all the more outstanding is that she's a woman who is excelling in what has traditionally been a man's field.' Mr Hodgson said he was surprised by Connie's achievement as she was a very 'quiet and modest girl'. 'She is only 15, so she is very young, even for her year,' he said. David Cottam, the school's principal, said Connie's comparative youth 'makes her achievement even greater'. 'We have had students in the top few in the world, but never the very top,' he said. 'It's wonderful. Everyone in the school is very, very proud of her. She is a delightful girl, and very modest. She deserves this reward.' Priscilla Poon also sat the maths examination a year ahead of schedule, as part of German Swiss International School's accelerated programme. But she said she didn't find the examination too much trouble. 'It was OK - sort of difficult, but not too hard as we had done all the preparation,' Priscilla said. 'I knew all the stuff.' Finding out she had won an award for coming first in the world, however, had been 'very shocking'. 'I didn't know there was such a thing,' she said. Mary Peart, head of the international secondary department at GSIS, said she had been 'absolutely thrilled' that Priscilla had topped the world and four students had achieved the highest marks in Hong Kong in other subjects. 'They are very, very good students and they work very hard,' Ms Peart said. 'We know that they can match the world, but it is always a thrill to receive an award like this.'