My sister sends her son to a private school, academia type, very intense on read/write/arithmetic, especially in their daily homework (more than 12 pages/day),

My sister sends her son to a private school, academia type, very intense on read/write/arithmetic, especially in their daily homework (more than 12 pages/day), and that's for age 5!!! Not exaggerate about the home work because I helped it, practicing writing many words, read short and easy stories, some summation like 12+4. Pretty surprising to see an age 5 do that, though painful for him.