A school "pass" is usually a permission slip to do things out of the ordinary. In this case, students with a sports pass go to a sport training activity instead of going back to the classroom. The Oxford Learner's Dictionaries are an excellent resource for English learners. https://www.oxfordlearnersdictionaries.com/definition/english pass - noun https://www.oxfordlearnersdictionaries.com/definition/english/pass_2 official document ​an official document or ticket that shows that you have the right to enter or leave a place, to travel on a bus or train, etc. a boarding pass (= for a plane) There is no admittance without a security pass. The Collins Dictionary is also useful. pass https://www.collinsdictionary.com/dictionary/english/pass countable noun A pass is a document that allows you to do something. I got myself a pass into the barracks. [+ into/for]

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A hall (way) pass ( in American English ) gives the student permission to be outside the classroom during school hours. You can have a pass to the restroom, counselor's office, to get water, to go to another classroom, etc.