Summarize:

When you see your crush, grab his gaze and hold it. Smile at him. Hold that look for a few seconds and then look away. Repeat it again and if he’s interested he’ll mirror your cues.   Use the flick technique: Meet his eyes, let your gaze fall to his mouth, and then lift them so that your eyes meet his again. Pair that with a coy grin.  When you know he’s watching you, play with your hair a little. This lets him know that you notice him noticing you. Fake it till you make it. The more you allow yourself to relax into the situation and feel comfortable with it, the more confident you will seem. Confidence is an aphrodisiac for men so use it generously.  Don’t fidget with or hide your hands as its often a sign of nervousness. Place them on your hips or leave them out in the open to promote better posture and signal to him that you are open. Keep your chin up and eyes level at all times, even as you walk to project confidence. Take care of your appearance. Groom with products that leave you smelling good and feeling good: like conditioners, lotions, fragrances, etc. Pay attention to the details. He’ll remember you from your back and forth looks. Comment offhandedly about something in class or make a joke. This takes the pressure off an initial one-on-one encounter and can feel a lot more organic than the individual approach attempt. If you’re feeling brave, approach him directly. If not, make approaching him more comfortable by setting the scene. The setup will provide the icebreaker you need to get the conversation going.   Bump into him and apologize frantically. Place your hand in your hair and laugh at yourself for running into him. Drop something, like a book or a pen, as you walk past him. He will either run after you to return it to you or you can retrieve it yourself and explain that you are clumsy.
Send cues of interest. Be confident. Approach him with his group of friends. Create an opportunity.