A school is an institution designed for the teaching of students (or "pupils") under the direction of teachers. Leopold hates school in most parodies. Schools are just like prisons (or hell) in Leopold's eyes. However in some series, he doesn't hate school as he has a nice behavior.
AngryGermanKid82's AGK Series
There are 3 schools in appearance, with other 4 mentioned.
In the first school, there was Sukscox and Principal Diknoz. It was destroyed in episode 54 by Leopold's Escape Key Bomb. In the second school, there was Stevenson and Principal Lixadik.
TheKewlOne96's AGK Series
There are 2 schools. In the first school, there was Kameltoe and Principal Douschbagg. In 10th grade, there was Sukscox. Throughout 10th grade, Leopold tried to blow up the school but failed. Only the school itself is damaged, no deaths. It was soon rebuilt. In episode 32, Leopold used Hitler's Mass of Destruction service to blow his school up.
In the second school, there was Fuxkidz and Principal Dikshitt. Dikshitt is a slave of Justin. After Dikshitt's death, Hitler became Leopold's principal. This school had been closed by the superintendent once. After that, Justin replaced Fuxkidz. After Justin's flee, Fuxkidz returned.
Adrenaline21's AGK Series
In Adrenaline21's AGK Series, the school Leopold goes on is Platanus School. The Downfall movie version of Nazi members are always the teachers and the staffs in Leopold's school. The school is mentioned in the original version of 1st episode (in the remake version, Leopold's school is now on full appearance as Hitler swears on Fegelein due to BND of Doom inside his gift while the bus takes all of the students into their home). In the 6th episode, the school makes its full appearance as Leopold and Johnny take the bus into the school.
In AGK in BND of Doom's Basic Math Education, the school Leopold goes is BND of Doom's school and the principal is Leopold's arch-nemesis, Adolf Hitler. Leopold and his friends must gather 7 notebooks before BND of Doom kills them with heart-attack level jumpscare.
Atarster's AGK Series
PrinceStickFigure's AGK Series
In PrinceStickFigure's AGK Series, the school is mentioned in the 1st episode of PrinceStickFigure's AGK Original Series and the full appearance of Leopold's school is in the 1st episode of PrinceStickFigure's AGK Rebooted Series as Leopold discuss with Jake about summer vacation.
GeneBernardinoLawl's AGK Series
There are 2 schools in appearance.
The first school was destroyed in episode 44 by Leopold's Keyboard of Doom.
TheGKProducer's AGK Series
In David's series, Leopold, Kaeru, Ronald, and Jake goes to A School for Assholes. Ms. Skateeta is Leopold's 9th grade homeroom teacher who is strict towards her class. She also hates him very much and treats him like shit. Mr. Turdfuhck is Leopold's math teacher and detention manager of the school (rarely seen). Mrs. Wideload is the principal of the school. Fredrik goes to a different school but Jake has been friends with him since kindergarten, and Jake told Leopold about it.