If you want deliberately to erase a high civilisation, reducing it to a seething, cheerfully-uncurious mass of conveniently-uncritical helots because you hate and fear what it’s achieved, what should you do?
Abolish their ability to do sums. At all.
The way to teach maths is as proper places do it, and as we did, say, 50 years ago. You start nice and early, not wasting the seven years of “primary” education in the colouring of posters about bullying, racism, slavery and healthy eating. You actively teach the young children maths routines repetitively, before the lifestage at which they get bored. Say at about 4, 5 or 6. Maths is a symbolic language, of which algebra is a subset only: the later you start, the harder it is to grasp intuitively.
By the time they shall become “eleven”, they can factorise cubic equations (and lower orders too), plot (real symbolic) graphs, understand basic trig and do vector resolution and combining, oh and also do all the silly pie-chart/histogram-reading nonsense and even tell you how Sameena ought to divide her sweets to share them with Cerys, Pradeep, Rhiannon and Nkongkwe.
No wonder “primary” “schools” are “failing” in this regard.