We do understand the word still as a young student. It is a rare word. Americans also prefer the word student.

Australians say students

I checked the dictionary, in the US, "students" refer to people studying in high school or in the university. However, it seems that both pupil and student can be used to refer to kids at school also. in UK, "students" usually refer to university student, and "pupils" refer to people studying in primary school or secondary( junior and high school) school.

Thank you Claire :)

@olga: yes, it has been a long time for me as well thinking about it :)