Try to give more freedom to your boy. Let him plan his time and do his homework but remind him that he needs to fact the consequence himself if he does not do it well.
Some parents told that she will resign/hold a job for呈分試,真的,很可怕,好像大執位一樣,平時唔多掂(中游)都可以跑上來,所以不可以輕視呈分試,you think that Good result may change school,讀私校need more money