Items required - 2 bsodas, one (two) zesty bar, one scissors, big ol' boots (situational)
The easiest route (for me)

Collect notebooks by - 1st is that nearer to swinging door, 2nd is that last, 3rd is that nearest to detention, 4th is that with basement, 5th with big ol boots and the last on the east
Before 3rd - collect zesty bar and buy bsoda (unless you failed the math in first notebook)
Before 6th - blast bsoda on Baldi, when you are after 5th, get bsoda on cafeteria and eat that zesty bar, that was in cafeteria
After 7th - blast bsoda on Baldi, watch out for Arts and Crafters
IMPORTANT THINGS!!!! -
1. watch out for Principal, if he catches you, you might restart (it isn't usually worth it)
2. When 1st prize is in the east hallway - collect 6th notebook and ride with him to the 7th and blast bsoda on him and collect exits, but when you are in 3rd, you need to use big ol boots (that is why I say boots is required) or scissors
3. You are in big trouble, when Bully is in the east hallway (unless there is Principal)
4. It isn't necessary to get hallway quarter
5. I don't prefer this route to party style, because you need a big luck with bsoda
6. I can also say, you don't need zesty bar, but it is better to have it
7. If somehow 1st Prize was sweeped by Gotta Sweep, you can restart or not (then you have to use zesty bar to get exits)

Items required - swinging door lock (seriously)
Notebooks collection queue - 1st and 2nd notebooks - it doesn't matter, 3rd is that nearer to detention, 4th and 5th notebooks, that are in east hallway, 6th is that with basement, 7th is that with big ol boots
Before getting 6th notebook - lock a north swinging door (between medium and east hallway
Before getting 7th notebook - you can go to cafeteria or immediately to 7th notebook
IMPORTANT THINGS
1. Watch out for Principal (when you get caught, restart, because it isn't usually worth it)
2. If somehow Bully spawns before cafeteria's door, you might restart (unless you have an item)
3. This is the best route for party style (you only need a lock)