Go from Goody Goody Nerd to Sexy Bad Girl in One Summer

Do people at school see you as a goody-two shoes and a smarty pants? Do you want them to see you in a new light? Then this article is for you.

Steps

Start saving money. This isn't going to cost a ton, but you are going to need some money.
Start working on getting fit. Sign up for a class that will get you in shape, boost confidence, and be lots of fun, like kick-boxing or hip-hop dancing. You'll be healthy and probably more athletic.
Start figuring out who you are. Since you don't want to be a nerd, who do you want to be? The sexy bad girl in a rock band or the sexy bad girl who doesn't care what others think.
Master the totally calm, I-don't-care attitude. It takes some getting used to.
Learn the walk. You have to have a total "I KNOW I'm sexy" walk. Make your walk your signature.

Buy a new wardrobe! Fill it with all sorts of daring, sexy clothes. Make sure you still look appropriate to the occasion. Show as much skin (and little skin) as you feel comfortable with. For example, if you think you're showing too much or too little cleavage change your top.
Wear make up that makes you look naturally gorgeous and glowing. Wear bronzer, dark brown eyeliner, mascara, and clear lip gloss. MAJOR TIP: A blond hair person should wear brown mascara instead of black. It would look more natural.
Go to a salon and get a new hair cut, or even a new color. Just remember the two secrets to sexy hair: texture and body. Use a hair texturizing cream or a salt spray for texture, and add tons of mousse for more body. Make sure you learn the techniques the salon uses, so you can replicate your new style at home.
Paint your nails red, black, or a french manicure, and wear lots of perfume, but NOT TOO MUCH!!!!

Try out for a sport. It's a good way to boost confidence, make new friends and keep in shape.
Put simply: be a bad girl! Be a risk-taker, be impulsive, and always say what you mean. Be a rebel. If you don’t wanna break the rules, bend them! For example, let’s say you have a school uniform, roll up your skirt a little or add lots of jewelry to make it unique. Just don’t do something stupid, like coming to school drunk or high.

Don't worry so much what haters think
Don't be a pushover! Never back down from a challenge, and stick up for your family, your friends, and yourself.
Don't get too caught up with being a bad girl. Just because you're now a bad girl doesn't mean you need to do bad things and get in trouble.

KEEP UP YOUR GRADES!!!!!! If you start failing classes to change your image, it's going to bite you in the butt. Stay smart, just don't brag about it and act grades aren't a huge deal.
Don't bale out on your friends! Just because you may meet people with your new attitude, it doesn't mean you have to change who your friends are!