it's actually tutorial. Generally you only need to choose one session that fits your schedule. You can go to the lectures first and the professor will probably ask you to sign up for your time session. So don't worry about missing it.
Tutorial is held by TA to go over the lecture contents and answer questions. Generally u only need to pick one session to go. It may be different depending on which faculty u r in, but u can wait until the lectures and ask the professor.
