BRITISH / AMERICAN college / university In both BrE and AmE a college is a place where you can go to study after you leave secondary school. In Britain you can go to a college to study or to receive training in a particular skill. In the USA you can study for your first degree at a college. A university offers more advanced degrees in addition to first degrees. In AmE college is often used to mean a university, especially when talking about people who are studying for their first degree. The is not used when you are talking about someone studying there: My son has gone away to college. ◆ 'Where did you go to college?' 'Ohio State University.' In BrE you can say: My daughter is at college ◆ My daughter is at university. In AmE you cannot use university in this way. You use it with a or the to mean a particular university. My daughter is at college. ◆ I didn't want to go to a large university. school When a school is being referred to as an institution, you do not need to use the: When do the children finish school? When you are talking about a particular building, the is used: I'll meet you outside the school. Prison, jail, court, and church work in the same way: Her husband spent three years in prison. note at COLLEGE, HOSPITAL BRITISH / AMERICAN at / in school In BrE someone who is attending school is at school: I was at school with her sister. In AmE in school is used: I have a ten-year-old in school. In school in AmE can also mean 'attending a university'. from Oxford Dictionary

at school, in the school, at university, in the university at college, in the college. it depends on the meaning, they are all true. if you are talking about the school as a building and trying to describe a place or a room, you can say " the canteen is in the school, not in the garden".or "the teacher's room is at the 2nd floor of the school" but you should you should use "she is at the school", when describing that, "she went to school to study, she is not here" hope this helps :)