I learnt the Sinkie model thing back in the day. It was a graphical representation of algebra, no big deal.
But I'm not sure what other stuff they had put inside the curriculum in the subsequent years and decades.
For example, maybe some MOE jiakliaobee might have tried to score points about pushing 'holistic education' or 'education for a future knowledge-based economy' or '
UN's Sustainable Development quality education' etc, then they added a bit of this and that nonsense into the curriculum, which then got bloated and simultaneously dumbed down over the years.
Anyway, I'm not a parent, a teacher or tutor, so I can't be arsed to find out.