Schoolmates of a boy left on a life-support machine after last week's Guangxi bus crash will pray for his recovery when they return to school on Thursday. Lam Chun-man, 13, a Form Two student at Ming Kei College in Tai Kok Tsui, suffered serious brain damage in the crash. He has been in a coma and on a life-support machine for six days. Chun-man joined the package tour to Guangxi last week with his parents. His mother Wong Yuk, 47, died at the scene when their coach plunged down a cliff in Pingshan on Thursday. The coach was on its way to the De Tian Waterfall. The accident killed five other Hong Kong tourists and an SAR tour guide. The boy's father, Lam Tao-kei, 50, suffered head injuries and a broken sternum in the crash. The father and son are being treated in Princess Margaret Hospital. Chun-man is in a critical condition in the intensive-care unit. The principal of Ming Kei College, Stephen Hui Chin-yim, said he only learned yesterday about what happened to Chun-man. 'The whole school will pray for him at a morning assembly on Thursday. We want to encourage and help him to recover,' Mr Hui said. The school also would provide counselling to teachers and students if necessary. The chairman of the Hong Kong Society of Critical Care Medicine, Dr Koo Chi-kwan, said doctors would conduct at least a three-month observation before classifying a patient as in a 'persistent vegetative stage'. 'Ninety-nine per cent of PVS patients show no significant improvement after a year. The chance for a full recovery is very slim,' he said. Dr Koo said although children usually had a better chance of recovery from brain injuries, 'for a 13-year-old boy the brain is rather the same as an adult's'. He said the issue of taking care of patients in vetgetative states was controversial. Doctors could withdraw treatment after consulting the patients' families, but the decision always was difficult and sensitive. 'Those patients need medical care round the clock; the service is expensive, but patients will show no improvement and have a poor quality of life, so the family is also put under stress,' he said.