First of, this is the Uni thread so 6th form users may not read this?
Are you sure that your friend is doing exactly the same course?
Is there any chance that they could be doing some other additional course that you’re not aware of?
Or that maybe they have to do some kind of remedial course that they are reluctant to mention to you?
Only the college can advise, you may have a slightly different course. It would be surprising if you were “not allowed” to be on the property so you could go in if you wanted space to study.