Use the Left Analog-stick and Right Analog-stick together to make the pointer move faster, thus giving you more time to complete the assignment.
Christmas
During Christmas, get a punishment and get the stick by the library - drop it and walk past the prefect and then you will unlock something.
Defeating Rustle
Throw a few fire crackers at him, then get up close and start punching him. Do this until he is defeated.
Endless Summer Chapter
It is possible to finish the game without 100% in all missions. However, if you watch the end credits you will see that Chapter 6, "Endless Summer", has been unlocked, which allows you can do any missions that you may have missed.
Unlock the Black Ninja costume by filling the yearbook. Then, go to a wardrobe and change into the Black Ninja costume. Go directly to the girls dorm and walk in. If you look at the map, you will notice that the yellow bar is at 0%. The staff will not see you unless you raise the yellow bar, but the students will.
Girlfriends fight
Kiss one girlfriend then walk slowly until you find another girl you can kiss. You must walk slowly so that the girl you just kissed will follow you. When you kiss the next girl, the two girls will start fighting.
Kissable cheerleaders
All the kissable girls are cheerleaders, except Beatrice (nerd girl), Lola (greaser girl), Zoe (townie girl), and the fat girl. You can see the girls as cheerleaders during the Gym class hour at football camp.
Kissing Kirby
After Chapter 5, you can kiss Kirby the jock.
Kissing Vince
After Chapter 3, you can kiss Vince the greaser.
Pirate hat
Swim forward in the bay from your prep beach house. Keep swimming until you cannot swim further then turn right to go around the island until you see a pirate ship. To the right on the shore is a hidden pirate. Beat him up to get the pirate hat.
Recommended costume
Go to a wardrobe where you can change. Put on the school uniform then go to "Head". Switch it from nothing to the mascot head. By doing this you will get good compliments on clothing, and making out time with girls is reduced, which gives you extra time and the health bonus.
See the "Bitch" vomit in "That Bitch" mission
Hide in the trash can behind you after you place the stink bomb in "her" locker. When she does not see you, she will vomit and continue to do so as you make your escape. If she catches you before you hide, she will run away screaming.
Shirts
After defeating a Boss (such as Russell), you can find their shirts in your room.
Trent romance
Get flowers from the girls dorm, then talk to Trent. If you talk to him twice, it will bring up the option to give him flowers. When you do so, the lips will appear and you can kiss him. Note: You must complete the first chapter in order to do this.
Various Codes
Black Ninja suit- Take a picture of all the students of Bullworth.
BMX Helmet- Complete all bike races.
Crash Helmet- Win the first set of Go-Kart races.
Double Carnival Tickets- Collect all G & G cards
Fire man's hat- Pull the fire alarm 15 times to unlock the fire man's hat.
Mo-Ped- Buy from carnival for 75 tickets.
Pumpkin Head- Smash all pumpkins either on Halloween or in basement.
Robber Mask- Break into 15 peoples lockers without getting caught, you will unlock the Robber mask.