The teacher said Sudi actively participated in games but did not complete his studies.
Cherop testified that he did not know where Sudi went, or whether he pursued secondary education.
The court heard that the witness wrote his statement in 2015.
The outspoken legislator was charged in October 2016 with three counts of forging academic certificates while seeking clearance from the Independent Electoral and Boundaries Commission (IEBC) to contest the General Election for March 4, 2013.
According to the prosecution, the MP forged his diploma in business management allegedly issued by the Kenya Institute of Management as well as a Kenya Certificate of Secondary Education certificate reportedly issued by Highway Secondary School.