One of the most important ways to help your teenager adjust to a new school environment is to keep an open dialogue about the changes happening in his life. Start talking about the subject early. Ask him how he is feeling about changing schools and listen with empathy. Remind him that it's normal to feel nervous or scared. The simple act of talking with your teen and being a supportive listener can help the transition go more smoothly.
There might be particular problems your teenager is worried about when it comes to changing schools. Do your best to solve them. If she's concerned she won't have fashionable clothes, take her on a shopping spree. If she's worried about finding her classes, take a tour of the school and help her find her way around. Tackling any problems beforehand can ease her fears once school actually starts.
While teenagers need structure and discipline, it is helpful to bend the rules a bit in the beginning. Allow your teen to socialize more or extend her curfew a bit. If she's old enough to drive, give her permission to use the car. Let her host activities at your house for her classmates. You don't have to give her everything she wants, but allowing more freedom gives her the time and space to nurture new friendships.
Adjusting to a new school can be hard for any teenager. However, watch for behaviors that indicate your teen needs help. Constant irritability, depression, isolation or acting out should be addressed sooner rather than later. You might need to get your teen counseling or make a better effort to talk with him if he's not taking the change well. Keep a close eye on his moods and behavior for his first few months at the new school.