A school is a place of learning where we acquire knowledge and training we feel will be beneficial to us in life. The essence of schools is to prepare us for the future, we don't necessarily go to school for the present but schooling is more for the future. There is a common knowledge humanity seems to have, which is that 'the future is more important than the present'.
In the film sequels, Harry Potter, authored by J.K Rolling and the lead act, played by Daniel Radcliffe we see that there is a spiritual school of witchcraft called Hogwarts that is as real as a physical school, where witches and wizards are groomed. They learn how to use their 'powers', develop their talents and they are observed in this school so as to discover who is special and what each witch/wizard can do. There is a truth in what J.K Rowling penned about Hogwarts. I believe there are spiritual schools as their are physical schools, for the physical realm shows and reflects the spiritual realm. If we humans know the importance of preparing for the future through 'schooling' how much more spirit beings like God and satan. The Bible talks about the school of prophets where senior/chief/master prophets had a school where they trained and groomed other prophets in their prophetic gifts. Prophets Samuel was a chief prophet or master prophet who trained other prophets. He had a school of prophets in a town called Ramah, as their teaching prophet, he was teaching and raising new prophets for the work of God. God knows the importance of His prophets being schooled and so does satan. I believe that's what Harry Potter's school Hogwarts reveals to us, that satan to trains his agents and initiates them early. Apart from academic schools, God also trains his warriors and champions through schools of life. Schools of life qualify you for the next stage and the glory ahead. In Psalm 144 verse 1 David said ''blessed is the Lord who teaches my hands to war and my fingers to do battle''. So God trains people.This suggests to me that God has a 'school' of training where He trains people to become the individuals and leaders He wants them to be.