Harry Potter 2: The Chamber of Secrets Cheats

Easy Beans
On the Fifth Floor you can gather beans from all the objects (not statues). I got five per pot/object. Then exit the fifth floor and take the door to your right, (the only other door.) Slide down the ramp and open the door. This will put you on the fourth floor. From her hit the other two pots three times each. Then repeat untill you only get three or fewer beans. Save game and quit. Restart your save game and repeat.

Merit Badge location
Face Fat Lady painting. Turn around and go straight towards the wall. To your right will be a door. Open the door and turn right. It should be right next to you. Find secret beans: Watch where Harrys head moves and flippendo the thing he looks at (generally jars or statues/treasure chests)

Get three new spells
When on the first floor go through the first door on the right. It will take you around to where the stairs move. Try to open the door at the end closest to the stairs and the handle will fall off. You can then open the door and go inside the small room. In the room you will find three new spell books in a row.