Fortunately, there are many things you can do to make this a successful school year, not just for your teen, but for the whole family as well. In general, the first thing to keep in mind is that parents and teens have a very different notion about the purpose of school.
School is their job.
Therefore, they should get good grades, just as we want to do well on our jobs. The perception of teen-agers is quite different. In their view, school is rarely more than their social world, interrupted by six or seven classes a day. Create an environment at home that models a love of learning. While these are things to have started from Day One with your child, you can still implement them in your home now.