The remembrance of Allah is the greatest act and Allah knows what you do. No dirt would remain on him. The daylight prayers are recited silently, while the others are recited audibly. There are many times when students are in classroom buildings and libraries when the time for the performance of the ritual prayer is upon them. Usually students have to use their own ingenuity to find a place on which they may prostrate, such as, vacant classrooms, unfrequented stairway landings, or unfrequented spots against walls.
Some libraries have chapel rooms that are usually locked.
That is best for you if you only knew. Moreover, colleges which provide space for weekly Christian services, should provide no less for Muslim students. When students have to eat in a school cafeteria which does not serve breakfast until after dawn and does not serve dinner after sunset, some accommodation needs to be reached to allow them to eat their breakfast before dawn and dinner after sunset. And let them draw their head coverings over their bosoms. There is no adherence to any dress code, such as, a physical education uniform, which violates dress requirements prescribed by Allah, the Exalted, and His Messenger Muhammad ibn Abdullah.