Geometry theorems in SEE Compulsory Math carry 4 or 5 marks. The secret to fast proofs is identifying arc relationships first.
The Arc-First Heuristic
Whenever you see inscribed angles or central angles, highlight the intercepted arc. If two angles subtend the exact same arc, they are either equal (inscribed) or in a 2:1 ratio (central to inscribed). This eliminates 80% of scratch work.