Rules for CE 2018 clearly mention aggregate of 120 marks to pass General Knowledge paper.

(viii) The three papers of General Knowledge (GK-I, GK-II & GK-III) are to be passed collectively by scoring 120 marks out of 300.
(ix(a)) COMPULSORY SUBJECTS (600 MARKS)

(1) Essay 100
(2) English (Precis and Composition)) 100

(3) General Knowledge :
Paper - I General Science & Ability 100}
(General Science: (MCQs = 20 marks, subjective = 40 marks)
Ability: subjective = 40 marks)
Paper - II Current Affairs 100}
Paper - III Pakistan Affairs 100}

(4) Islamic Studies or Comparative Study of Major 100
Religions (For Non-Muslims)

Total : 600

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