以下几种常见的表达可以询问 “在校期间能留学吗”：
Can I study abroad during my time at school?
Is it possible to study abroad while still in school?
Can I pursue overseas studies during my school years?
如果你想表达得更具体，比如说明是在大学期间等，还可以说：
Can I study abroad during my college years?
Is it possible to study abroad while I'm in university?