Well it really depends if you have dyslexia or something but lots of people in my school have spelling issues and they're in 5th grade.
Twenty percent
20 percent !
20 percent !
Paediatrician is the British spelling. Pediatrician is the US spelling.
about 33%
99.9%
i think only about 25%
There are no scientific studies for this
No, Jamaican children often do better in the US because our educational syllabus is very combust.
Children
That is the correct US spelling of "fertilize" (to add nutrients to soil).
The spelling "customisation" is used in the UK, but in the US it is customization.