Well, you CAN NOT grow taller in 7 days for 5 cm. Unless you are in a super growth spurt or something. Best bet would be trying a new hairstyle which would increase your height, improving your posture and getting platform shoes. If you want to find out how to do that, check out the grow taller exercises page.
You could try what Bobby did in the episode of the Brady Bunch and just hang from the monkey bars for a couple of hours.
You can use some lifts. Here is a site that may help you with that.