Aim for "True Wizard" in every level by collecting a high volume of studs. Once achieved, you cannot lose it, even if you lose all studs later in that level. 2. Spellcasting Strategy
To unlock everything in Free Play, you must obtain a Dark Magic character (like Bellatrix or Voldemort), a Strong character (like Hagrid), and a Key character (like Griphook).
While many spells return from the first game, several new mechanics are vital for progression: Go to product viewer dialog for this item. LEGO Harry Potter Years 5-7
You cannot reach 100% completion in your first playthrough. Focus on finishing the first to unlock essential characters and spells.