Achieve your dream of becoming Blair Waldorf, Serena van der Woodsen, Cher Horowitz, Dionne Davenport, even Spencer Hastings from our “How to Become a Preppy Girl in High School” article with tips, tricks and of course, preppy outfit ideas suitable for young women like you. Be classy, never trashy. First off, preppy girls take lots of care for their bodies. If you haven’t noticed, they are all very active in physical activities like tennis, golf, lacrosse, swimming, horse-riding, anything…