NOT all students will get to enjoy their summer vacation this year even though it is traditionally a time for relaxation and fun. For some, especially the senior ones who are going to take public examinations next year, it will be work as usual because they will have to go back for supplementary or remedial classes. But, the vice-president of the Professional Teachers' Union, Mr Au Pak-kuen has called on teachers to help students strike a balance between studies and extra-curricular activities during the summer. ''It is good to arrange some lessons for students during the vacation, as this will give teachers and students more opportunities to meet and communicate,'' he said. ''But these lessons should be carefully planned so that they will not be too tight for students. Summer vacation should be a time for students to relax and recover from the busy school year just past. Too much work will add pressure and affect their studies in the new academic year.'' Mr Au suggested two morning lessons a week and said the teaching should be held with a lively and active approach. ''Students get bored studying in the classroom the whole year. Other ways of learning, such as games and audio-visual exercises, and lessons in a pleasant environment like an air-conditioned room, can stimulate their enthusiasm to learn.'' But he warned that pupils in kindergartens and junior primary schools were too young to have lessons because ''it may be too demanding for them''. ''Intensive drilling courses on the HKCEE or A-level exams are not acceptable as they will be too much for students.'' The Education Department, at present, does not regulate supplementary classes for the summer. Schools need not report to the department and only permission from parents are required. Some schools make the classes compulsory and students absenting themselves will be recorded. Sha Tin Tsung Tsin Secondary School holds supplementary lessons for Forms 4 and 6 students, and remedial classes for third formers. ''The number of lessons is decided by individual teachers. Sometimes, the lessons are set five days a week for the convenience of teachers and students. All lessons are compulsory,'' said principal Ms Yip Sau-wah. When asked if students would feel unhappy, Ms Yip said: ''Unhappy? They should be delighted as we are offering them free extra classes. Our teachers are sacrificing their holidays for students' benefit.'' Lam Woo Memorial Secondary School also arranges summer classes for Forms 4 and 6 students. ''Their curriculums are so tight that we have no time to teach all the chapters. So, we have to hold extra lessons in summer before the public exams are held,'' said vice-principal Ho Hok-kin. The principal of CCC Kwei Wah Shan College, Mr Wong Yiu-so, said the school had tried holding extra lessons for senior students in the past, but they were ineffective as some students did not turn up and this affected the teaching schedule.