It got to my understanding that the student of the national open university of nigeria pay for course material and they did not collect the books or were giving one or two out of their courses, they are only left to buy the books from sellers at expensive rate. Are you caught in between, I want to help you! If you can read ebook then I will send all your course material to you, if you are interested send a mail to oriyomi1994@gmail.com to show your interest and I will get back to you quickly