Poor exam results, cannot go to top elite schools and win president or rhodes scholarship. Life would be much harder if the son had to strike out on his own. Probably end up like most average sinkie losers who will be driving taxis when they reach their 40s. In contrast, look at how good life is for the top president scholars who go on to be PAP leaders.
Even kids know that if they don't do well in their exams, it's the end!! Other kids should learn from this example and study harder! Spend more money on tuition if necessary!