Step 1: Score Eye opening (E).
Eye opening to pain = E2 (spontaneous 4, to sound/speech 3, to pain 2, none 1).
Step 2: Score Verbal response (V).
Incomprehensible sounds = V2 (oriented 5, confused 4, inappropriate words 3, incomprehensible sounds 2, none 1).
Step 3: Score Motor response (M).
Localises to pain = M5 (obeys commands 6, localises 5, withdraws 4, abnormal flexion 3, extension 2, none 1).
Step 4: Add up.
GCS = E2 + V2 + M5 = 9.
Key fact: Eye-to-pain (2) + incomprehensible sounds (2) + localises (5) = GCS 9, placing the patient in the moderate head-injury range (9-12).