HARRY POTTER AND THE CHAMBER OF SECRETS UNLOCKABLES
Fourth card
Secret room, corner of Gryffindor common room where you light torches with incendio to open a wall.
Fifth card
Bonus room in portrait hall, with male portrait. In order to get the last spell, Alohomora, you must get all five Famous Witches And Wizards "Charms" cards in your collection.
Skurge spell
Defeat Peeves the first time you enter the Restricted section of the library on the second floor.
Girding Potions
Finish the five Famous Witches and Wizards card POTIONS, and you will receive five Girding potions.
Increase your boost bar
When at the flying lessons press A at the start when the countdown reaches 1. Timing is important in this trick.