HONGKONG'S star woman swimmer Robyn Lamsam is contemplating giving up her studies for one year to concentrate on preparations for the 1994 Asian Games in Hiroshima, Japan. Lamsam, the South China Morning Post's 1992 Student Sportsman of the Year winner who excels in both sports and studies, has been told by national coach Bill Sweetenham to make the sacrifice. ''Nothing has been decided yet, but there is every likelihood I'll stop schooling,'' said the Diocesan Girls' School fourth-former. ''I'm bound to swim next year, and I'm afraid I might muddle things up if I don't quit school because it would be difficult to swim and prepare for the school cert. ''I'll have to discuss things further with my parents before making any decisions. But I think over the next couple of years my priority would be swimming.'' Lamsam is the territory's fastest female swimmer despite her tender age of 15. She holds the national freestyle records over four distances - 50 metres, 100 metres, 400 metres and 800 metres. She was Hongkong's only woman swimmer at last year's Barcelona Olympics, and also the only representative at the short course World Cup series. She had a most fruitful 1992, and among her best achievements was perhaps her seven-gold haul at the Mantas Invitational Age Group meeting. Lamsam sounded a warning as one of Asia's brightest swimming prospects at the Asian Pacific Age Group Championships in Beijing early this year by winning four medals - one gold, two silvers and a bronze. She was competing in the 14-and-under division then, and her victory in the 50 metres event was a meet record. Her winning time of 27.08 seconds beat the meet mark set by China's world renowned freestyle specialist Zhuang Yong, a gold medallist at the Barcelona Games. Lamsam currently ranks seventh in Asia in the 100 metres freestyle. Coach Sweetenham considers her the territory's brightest medal hopes at next year's Asian Games. Besides winning the South China Morning Post Student Sportsman of the Year award, she was also recently picked for the prestigious Coca-Cola Junior Sports Stars awards.