"Students at international schools spend most of their time on math" If I were at an international school, I think I would spend most of my time on language. :) hope this helps.

There are two errors in this sentence. 1. There is no article before the singular noun 'international school'. It isn't clear whether you are referring to (a) one particular school - 'an international school' or (b) international schools in general - 'international schools' Which do you mean? We need to know this before we can correct your sentence. 2) The words 'most' and 'their time' need to be connected with 'of' - 'most of their time.' NB The word 'maths' is correct in British English. There is no need to alter this unless you particularly want or need to change your sentence into American English.

''Students at the international school spend most of their time on math''

"Students at the international school spend most of their time on math.'' Saying maths sounds weird best to say math.

Both of the answerers are American English speakers, and have changed maths to math. Maths is correct to me, and most other British English speakers. It's up to you which flavoUr you prefer!