The mathematics questionnaire for Matriculation exams leaked before the start of the paper on Wednesday.
The exam was scheduled to start at 9:30am but the question paper was available 30 minutes earlier.
On Monday, a controversy was triggered when the physics paper was leaked on social media.
Following the mismanagement and chaos during the Secondary School Certificate (SSC) Annual Examination 2021, the Sindh government had taken strong notice and summoned the controller examination of Board of Secondary Education Karachi (BSEK) who assured Adviser Nisar Khuhro of taking corrective measures.
Earlier on Monday, BESK Chairman Syed Sharaf Ali Shah suspected that the central control officers (CCOs) had a hand in the controversy surrounding the paper leak and delay in the delivery of the questionnaire.
Shah had said it seemed as if the CCOs were involved in the conspiracy, adding that they will no longer be performing this duty.