APMF My experience of Hong Kong is being married to someone who grew up in Mong Kok, living and working there in the Hong Kong Civil Service and at HKU for three years, completing a Masters in Chinese Studies and now in the process of completing a PhD. I doubt very much you have the slightest idea what the "typical Hong Kong Working Class mother" is like. The majority will be very basically educated immigrants from Guangdong who are pushing barrows around the markets, trading across the border, working in SMEs, or taking whatever economic opportunities arise, living with a family of 5 in 50 sq ft. The children who have emerged from that background, though many would be raised in Guangdong by Grandparents, would struggle to get the bare minimum of homework done just because they share their living space with so many others and a TV, and the expectation would be that they will follow in their parents footsteps following whatever economic opportunities there might be on either side of the border, and hopefully not getting involved with the Triads. They may have a stronger work ethic but academia does not beckon. Also amongst the WC mothers would be the Phillipinos, Nepalese and other immigrants that the Hong Kong provide with no Cantonese language training to enable them to access the education system (despite the considerable contribution they make to the HK economy, especially in the case of the ex Gurkhas) whose children are schooled by whoever has some knowledge, in disused buildings with whatever books they can scavenge. Or perhaps they are fishermen, or islanders, or farm in the New Territories.
I doubt very much you have ever known well someone who wasn't middle class from Hong Kong, and probably most were from the minority who are actually from Hong Kong, and not immigrants from the mainland in the last few decades. As the SARs crisis highlighted even the solidly middle class live in crowded flats that are too small to be healthy (the SARs virus was exceptionally transmitted by being directly sucked out of the soil pipe by decondensing water in the minute showers). It is these families who work all hours to pay for the tutoring etc to get through the local school exams. They do so because competition is intense and if they don't have the economic means to access an International Education or send their children overseas they have to play by the rules of the local education system, a relic of the Imperial examination system, with all the disadvantages I have already highlighted.
My friends who have advanced through the civil service had done so after a life dominated by cramming for exams , and generally were more driven by peer culture, and by the knowledge of what their parents had endured to get them to Hong Kong in the first place, than any pushyness by their proud and loving parents. And they believed that there was a need for change in their education system.
I would be very careful about drawing glib comparisons with a culture you do not fully understand.
It is a glib Daily Mail stereotype that all British working class parents are the feral underclass. I know plenty of working class parents who encourage their children and set firm boundaries for their behaviour, making sure that homework is done etc. The system fails those who do not have parental, and peer support, but it increasingly does not value those who are never going to be academic, those for whom a C in English was something they had to work very hard to achieve, even with parental support, and need opportunities that will enable them to meet their potential