This a guide for teaching you on how to use all the currently known strats that I know. I will eventually make a video on this, so stay tuned.
1st Strategy: Running
Running is something not seen in this game. In order to do this, simply hold two keys at the same time.
I don't know why this exactly happens, but the same thing happens in other games.
2nd Strategy: 0/7 Notebook skip
In order to do this, start the game, then look in the same direction as the notebook, and left click. When executing correctly, you will collect the notebook.
This glitch happens because the walls are made up of planes (flat squares with no length).
3rd Strategy: 3/7 Button skip
This skips having to activate most of the buttons. Instead, you only use 2. Just click on the first button you see (The pressure plate that spawns the button behind you), and then use the running strat to go through all the deactivated walls.
4th Strategy: 5/7 Bully skip
This strategy just involves jumping over a wall, then collecting the notebook. Just walk up the boxes, hop on the wall behind the boxes, then use the running strat to gain enough speed to jump and land on the wall.
5th Strategy: 6/7 Super Speed
This isn't really a strat, but whatever. Just get the broom, and use the running strat.
These are all the strategies that I know, and that I discovered (except for the bully one).