Here's another strategy:
- don't collect any other items except sodas (and 25 cent coins), chocolate muffins, fully chocolate muffins or chips, magnets and the blue key
- first, collect the two sodas from the trashcan in the punishment room and from the room next to it
- ignore the notebooks in the corridor where the bathroom and the punishment room are for now
- !!! Go to Mr. Mix NOW, believe me, it will save your a** !!!
- hurry and watch out for Viktor at that point, then go to the area past Mr. Mix's kitchen
- collect all the notebooks you find there
- lure Viktor into the dead end with the two classrooms and the vending machine as far as you can, then run all the way back to Mr. Mix's kitchen (if you have one, use a fully chocolate muffin once your stamina is drained, or maybe you get lucky and Headteacher sees you running and drags you all the way back very fast. This will give you a lot of time.)
- !!! Go to Mr. Mix one more time, just to make sure !!!
- quickly collect all the notebooks from the corridor with the bathroom and the punishment room now
- then head to the area with the school garden
- !!! now you should look for chocolate muffins and the magnet, just in case you don't have them, yet !!!
- first, look if there are notebooks in the rooms near the school garden
- then walk further to the dead end and collect remaining notebooks
- now, if you have all the notebooks at that point, go to the shortcut of this area (it's the tiny room next to that one single locker)
- !!! wait, until you see Viktor, then go in that tiny room and leave through the door on your right !!!
- !!! hurry on your way to the very first classroom, you will find a second magnet on the floor, if your inventory isn't full, grab it !!!
- close the door that leads to the area where Viktor will come from with one of the magnets, it's the door on your left
- go into the classroom close it's door with the other magnet you may have
- then get your calculator, hurry with solving these examples
and the win will be yours!
Oh, and one more thing:
- press Q to pause the game