ALL CLASSES!  GO TO HELPFUL LINKS AND CLICK ON http://www.khanacademy.org/
THIS SITE HAS VIDEOS FOR ALL TOPICS. FIND THE TOPIC YOU NEED HELP ON AND WATCH THE VIDEO. THEN, YOU CAN GO TO PRACTICE EXERCISES.  LOOK AT THE TOPIC WE ARE WORKING ON UNDER CLASSWORK IN YOUR ASSIGNMENTS. FIND THE CORRESPONDING TOPIC.