The glitch that allows to cast not unlocked spells is present in PS2 as well. To use it open the spellbook, select any spell using the Circle key. After that switch to any other school except fire and press Square until the voice line plays. The set of spells differs from the PC version. Air - Starfall Water - Mind Blast Earth - Lloyds Beacon Dark Elf - Souldrinker Dark - Divine Intervention Mind - Heroism Body - Enslave Light - Power Cure Dragon - 0

Leveling not learned skills Example

1. Press Circle to pick up an enchant item scroll
2. Switch to the skills tab using L and R buttons
3. Use the Enchant Item scroll by pressing Square
4. Switch between the characters and try leveling skills by hovering over them and pressing Circle