There are a few ways that you can leave school without getting caught. The first way is to simply walk out the door. This is the most obvious way to leave, but it is also the most likely to get you caught. If you are going to try this method, be sure to stay close to the buildings and out of sight of the security cameras.
Another way to leave school without getting caught is to take the bus. This is a bit more difficult, but it is still possible. You will need to know the bus schedule and be sure to be at the stop before the bus arrives. Once the bus arrives, simply get on and find a seat. Once the bus starts moving, it will be very difficult for the school to find you.
A third way to leave school without getting caught is to climb over the fence. This is the most difficult method, but it is also the most effective. If you can manage to climb over the fence, you will be free and the school will have no way to find you.
Whatever method you choose, be sure to plan ahead and be careful. If you are caught, you will be in a lot of trouble.