student
‘student’
In British English, a student is usually someone who is studying or training at a university or college.
The doctor was accompanied by a medical student.
They met when they were students at Edinburgh University.
In American English, anyone who studies at a school, college, or university can be referred to as a student. People studying at a school are also sometimes called students in British English.
She teaches math to high school students.
Not enough secondary school students are learning a foreign language.
‘schoolchildren’
In British English, children attending schools are often referred to generally as schoolchildren, schoolboys, or schoolgirls.
Each year the museum is visited by thousands of schoolchildren.
A group of schoolgirls were walking along the road.
‘pupils’
In Britain, the children attending a particular school are usually referred to as its pupils.
The school has more than 1300 pupils.
Some pupils' behaviour was causing concern.