When you adjust to something, you change so that you can fit in, conform, or keep on going. Arriving at a new school almost always requires that you adjust a little. Once you adjust, you'll find you're as happy as you were in your old school.
To adjust doesn't mean to transform in a major way. It implies small but important changes that make a big difference. If you adjust your speed by just ten miles per hour, you'll get more than fifty more miles per fill-up. You can adjust your hair to make it fancier, you can adjust your lifestyle to make it more sober, or you can adjust your attitude to make yourself less annoying. You used to have to adjust your TV antenna to get a better picture. Ask your mom.