This follows months of severe criticism of the CJ Koome by Nelson Havi.
The family of the headteacher who was among the three people killed by a light aircraft in Kilifi County has revealed her last moments before his untimely death
Road users have been advised to exercise caution while using the superhighway.
Nairobi motorists have been handed reprieve by the governor.
He was among the 962,512 candidates who sat for the exam last year.
The incident comes amid a spate of abduction incidents across the country.
The MP revealed the details after a call with Education Cabinet Secretary Julius Ogamba.
The protests are likely to lead to heavy traffic congestion and disrupt business in the capital.
Videos and images obtained by Kenyans.co.ke showed hundreds of residents holding jerricans while rushing towards the scene.
The marathon will take place on Sunday, January 12.