If you think that sitting in class and listen and you will be able pass physics. You will be in great trouble. Physics is not a simple subject.
Your teacher can only give you an introduction of the topics and guide you what/how to study for the examination.
Please read these links to understand why all lazy students cannot pass physics.
http://www.wikihow.com/Do-Well-in-Physics
http://physics.illinois.edu/undergrad/post-details.asp?1491
http://www.unf.edu/~jgarner/help.html
http://people.physics.tamu.edu/hu/221-fl08/general%20advice.pdf
https://web2.ph.utexas.edu/~turner/classes/HowToStudyPhysics.htm