What do you consider "bad behaviour"? My response might be different if they are experimenting with drugs, shoplifting and beating up other kids than if they are eating up all the food in the house between meals, forgetting to hand in homework on time and heading out with friends without giving you an itemized itinerary of where they will be every moment that they are away from home.
Without knowing what the problem areas are, I can only speak in generalities. A 13 y.o. will test limits and try to establish their independence. That's all normal and it's a balancing act to extend freedom while still providing guidance. I think working on mutual respect and trust is crucial. Since you are seeking counseling, it sounds like he is dealing with more than the typical stretching of wings that teenagers try out, so respect and trust may be tough right now.
I don't get uptight about things that other parents might fuss about. My teens have pretty bizarre hair (shaved bald, mohawk spikes, coloured - we've seen it all), and clothes (studs, patches, tears, stencils). Since I don't give them a hard time about appearance or the music they listen to or where they go with their friends or how they spend the money they earn at their part-time jobs, there isn't an atmosphere of resentment or rebelliousness about things like attending school and helping around the house. We do have standards for the things that matter to us like using good manners, attending school, obeying the law. We've focused on having a good attitude about those things and if they have their own ideas about other stuff, it isn't shocking to us.
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