Make sure you really want your crushes attention, If he or she isn't really what you want, having their attention can be pretty annoying.
Step2
Be yourself, you want them to like you for you. Resist the temptation to put on a show or to do anything that just isn't you just to get his or her attention.
Step3
Change something up with your look. Don't change who you are just try something different.
Step4
Start up a conversation with them when the opportunity is there. If you have to ask them for a pen, anything to get their focus on you and when you get that just smile and make eye contact.
Step5
Sit next to them, talk to them and soon you'll have their attention.