If you are the kind of student who looks searches “how to take my class online” then searching this question is totally your right! Access to the quizzes and exams is in the hand of the professor. A lot of institutes have software on which students can easily access and attempt quizzes and exams online. However, those students who barely attend online classes may not have an idea about this. So, access to such things is either through email, google forms, or the institute's software.