In Tony Hawk's Pro Skater 1 + 2, there is a second grade level in the Tony Hawk Pro Skater 2 course level list that lets you search for five bells to slide the wall against to knock over. It's similar to the first level, so it should be pretty much the same, but with new locations.
All bell locations at school 2
The first bell is to your immediate right when you start the level. You should see it above the small ramp, under the light. Whenever you are looking for one of the school bells 2, look for a light above them. It is a deadly gift to their location and makes their search easier.
The second bell is further from the starting point. You can get there by taking the path around the corner to the first bell which takes you into a courtyard. Go to the left corner of the courtyard and look for a building that indicates the east wing on top of it. You should see the second bell in the corner, above a ramp to the right of this entrance.
The third bell is to the left of the east wing building from the previous bell. Walk down the train tracks and hug the wall to avoid the security guard in a golf cart. Continue to hug the wall and stand on the right side of the area. The next bell should be right next to a building with a sign that says “Shopping Class”.
The next bell is quite close to the third bell. To the left of the Boutique class is a small parking lot with a basketball hoop. To the left of the hoop, above a blue bin, is the fourth bell.
The last bell takes you back to the ramp you came down after the second bell. Turn left and follow the buildings to the front of the Matt Helsom Memorial Gymnasium. Turn around and there will be a space between two constructions that will lead you directly to the bottom of the stairs. Turn right and you can see the last bell on the left wall.
