Are these your text books ? Biochemistry , General Ecology , Botany , Cell Genetics , Molecular Genetics ...   Yes . I gotta review all of them for the final exam . It is just around the corner .   Oh , right ! Do you have many exams at the end of each semester ?   That depends . Some semesters have many , some don't . And some courses don't have exams but only ask for papers . That's easy .   And when do you prepare for your final exam ?   Honestly speaking , most students prepare it one month before the exam .   Really ? You only review your lessons in one month ? Does it work ?   Of course , it's useful . And it's very crucial to have the copies of teacher's notes , because most questions in the exam are based on them . 