Nursery school
Adejumo started his early education at the Sacred Hearts Nursery school, Akure, in 1959 and concluded it at the St Mark's Primary School, Offa in Kwara State. For his post primary education he attended the prestigious Ibadan Grammar School between 1968 and 1974. Because of this, he gained admission to the Premier university in Nigeria, the University of Ibadan in 1975. He graduated from the university with Special Honors in Animal Science, Second Class (Upper Division), in 1976. He studied on the Federal Government of Nigeria Scholarship for his master's degree Program between 1979 and 1980. Adejumo had his doctorate degree on the scholarship of the University of Ibadan as a university scholar between 1980 and 1983.