Elementary school is the first level of school for American children.  It's called primary school in many other countries.
I guess it's the same across many other countries too
In the United States, after elementary school, kids go to middle school, which used to be called junior high.
I see, in the south east Asian countries it's called secondary school. Logical progression from Primary to Secondary
That makes sense!  The ages of students at primary and secondary school can vary even within countries.
Well, again going back to the region i belong to, i can say the ages don't vary much. Quite unlike in the west i guess.
Oh interesting. Does your country have a good basic education system?
Unfortunately no. It doesn't. 
That's a shame. Governments should prioritize good compulsory education for all citizens.