My school
The School is a location first seen, but not named, in Petscop 2, and first mentioned by name by the Shadow Monster Man during Petscop 6, who spells out "WHERE IS THE SCHOOL" in letter blocks, when Paul asks Red Tool the same question, it responds "You can't go back in time".

The school is mentioned by Pink Tool in Petscop 7, who states that Marvin "ALSO WANTS 1000 PIECES FOR “MACHINE BEYOND SCHOOL BASEMENT STAIRWAY"". The note in Care's Room briefly mentions "A young person walks into your school building" in reference to "You".

Petscop 11

The loading screen that appears when Paul enters the room with Marvin and the Needles Piano. Supposedly, it showcases an exposed piano mechanism with a PlayStation controller at the top of the piano.

The school is first visited in Petscop 11, when the player explores it in the Demo Area, it appears to be in a very out of place first person perspective. The school's interior is filled with lockers and several doors. The Green Tool, Marvin, and the Needles Piano are encountered in the school, as is a locker secured with a padlock which the Demo mode player is unable to open.