Sir Denis O'Connor, outgoing HM Chief Inspector of Constabulary, will give evidence on Olympics security.
Stephen Greenhalgh, Deputy Mayor of London for Policing and Crime, will give evidence on policing in London.
Metropolitan Police Commissioner Bernard Hogan-Howe has also been asked to give oral evidence.
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Exams regulator Ofqual has launched an investigation after an A-level maths paper from exam board Edexcel apparently surfaced online.
Relatives of Annie McCourt picketed the Regulation and Quality Improvement Authority in Belfast.
The Labour leader also called for a fresh approach to resolving the conflict in Syria.