The efficiency of educational institutions is critical in the justification of resource allocation and use. However, some developing countries like Kenya face efficiency challenges regarding resource utilisation and the flow of students through the school system at various levels of education and programs. Past research in Kenya has focused more on resource utilisation in public schools. Very few studies have looked at the internal efficiency of public vocational training centres (VTCs). This paper assesses the level of internal efficiency in Kenya's public vocational training institutions through a mixed research design. The findings reveal low levels of internal efficiency as indicated by low enrolment, high dropout and low completion rates in the VTC institutions. The result also shows a low level of tutor utilisation. These results provide vital insights into improving the internal efficiency of public vocational training institutions in developing countries. The study recommends, among other things, subsidisation of examination fees to enhance students' completion rates.