[DannyTN]

Possibilities include:

• Son is rebelling against father's methods.
• Son has some learning disability
• Dad is bad at math and teaching son wrong.
• Dad is teaching basic mathematics but test is focusing on properties of mathematics like the distributive property or the commutative property.
• Dad failed to find out what was actually being taught and/or how test is structured.

[nickcarraway]

Dad is bad at math and teaching son wrong. (My guess)

[nickcarraway]

Let’s congratulate this father and son for defeating Asian stereotypes.