The study examined the nature of classroom assessment practice of secondary school teachers and how this could sustain national development. A survey research was carried out on senior secondary three class (SS3) students in Southwest Nigeria. Two senior secondary schools were selected from schools in each of the six state capitals in Southwest and 50 SS3 students were selected from each of the selected schools through simple random sampling technique. Total student sample used was 600. Three research questions were answered and one hypothesis was tested at P<0.05.