Beyond elemental advantages, consider 'CC (Crowd Control) Immunity' for certain bosses, 'Skill Chain' synergies (e.g., a student buffing another's EX Skill), and 'Terrain Advantage' for specific students. Learn to 'reset' stages if a battle goes poorly to save AP. In Total Assault, practice 'manual play' to optimize EX Skill timing and target prioritization for higher scores. Experiment with different team compositions and student placements.
