THE three Tse daughters will try to sleep well and exercise more in preparation for the new school year - and to ensure they can carry their heavy schoolbags. Po-ting, Po-man and Po-yu, who will be in Primary Five, Forms Two and Four, are among the hundreds of thousands of primary and secondary students who will return to school on Thursday after the two-month summer vacation. The Education Department at the end of last school year issued guidelines suggesting ways of easing the load to protect students from back injuries. They encourage students to pack their bags more carefully and ask schools to provide facilities for storage of stationery and personal items. Publishers are urged to delete unnecessary information from books, use lighter paper and split textbooks into two parts. But Tse Li Sun-nor yesterday said the guidelines were useless. She said she had not heard from school that her children would be given lockers and the new textbooks were as heavy as last year. Po-ting, 10, last year carried an eight-kilogram bag - about a quarter of her own weight - although she only brought the books she needed for the day. ''She had seven lessons a day so she had to take at least seven textbooks. There were so many homework and exercise books she needed to bring back to school,'' Mrs Tse said. ''I would rather she brings more books lest she might forget one and be punished by teachers,'' she said. Po-ting, who is 1.3 metres tall, will collect her exercise books from school on Thursday, and her textbooks next Monday. She complained she always felt tired and her back was painful after school. Po-man, 13, and Po-yu, 15, said the thought of their heavy schoolbags meant they were not looking forward to school. Po-man said her Form Two studies would cover 10 subjects and 19 textbooks which weighed about 8.5 kg. Secondary school teacher Pauline Chow Lo-sai said the suggestion that schools should provide lockers or other storage facilities was not feasible because many schools did not have enough space.