They may be done as a project in which you mobilize the entire student group or just get interested Christians to conduct questionnaires. People are not too interested in what you have to say, but they love to hear themselves talk and be able to express their thoughts to others. If you will take time to listen to them, they will often take time to listen to you. Anyone who listens to them has a good chance of being their friend. So, the art of asking questions can be a great place to begin your witnessing encounter.
Nobody does it.
Everybody goes somewhere. This is a great time for your Youth Alive group to sponsor a big get-together for everyone. You may also want to provide free pizza, ice cream, hot dogs, etc. Often, people in the church will be willing to help pay for the costs of an evening like this. Following a long period of games and recreation, everyone should be invited to stay for a film, musical entertainment, speaker, etc.