The front office is where everything happens, and the ideal situation for a student who wants to find out things is to make friends with the receptionist's children. The receptionist sees all and will generally discuss it with his or her spouse at home. Naturally, the children are going to hear things and are the best sources for school insider gossip. High school students, especially, are the nosiest humans in the world, and are always eager to hear the latest tidbit.
The front office is also the source of news of future happenings. If a regulation or similar is coming down the pike, the front office will know it first, and in high school, forewarned is forearmed. Making friends with the receptionist was always good politics.