To maintain quality of NCE product from the colleges in Nigeria, the Teacher Standards specified student’s assessment guidelines for NCE institutions. The purpose of this study, therefore was to assess the implementation level of NCE institutions on these assessment guidelines in South – south zone of Nigeria. In order to carry out this research two null hypotheses and a survey design were used for the study. Data were collected from a sample of 1100 participants (400 students, 600 lecturers and 200 non-teaching staff) selected with multi-stage sampling technique using a researcher designed questionnaires with coefficient of stability 0.8. These data were analyzed using Chi-square statistics. The following findings were made There is significant compliance of students’ assessment on instrument development in the Colleges of Education with the NCE assessment standards. There is significant compliance of students’ assessment on administration and computation grade point average GPA in the Colleges of Education with the NCE assessment standards. There is significant compliance of students’ assessment on structure and functionality in the Colleges of Education with the NCE assessment standards. It was recommended that the lecturers, Non-teaching staff and Students be commended for their level of awareness on the teacher standards to enable them participates in the study. And that monitors should visit these Colleges to study their implementation strategies in order to introduce them to other Colleges.