Delete 5 Level 3 Topics Only

This will ONLY remove these 5 topics and their questions. Everything else stays untouched.

Topics to be deleted:

❌ Standard Form (Module 2)
❌ Inequalities (Module 5)
❌ Quadratic & Reciprocal Graphs (Module 6)
❌ Simultaneous Equations (Module 6)
❌ Pythagoras' Theorem (Module 9)

Will NOT be affected:

✅ All other topics remain
✅ All modules stay intact
✅ All progress data preserved
✅ All other questions remain