.. The secret room

Check out the ferret head. You get a video cassette. show spoiler Video cassette

Remove that rug. It is nailed down. ( Take the hammer and use it on the rug. )

Did you try the different tools on it? ( You can just pick the padlock up. )

Break the toilet door ( Use the railing you find from the ground on the door. ) to get the plunger from the toilet.

You can now enter the school.