When you master a tool, you will then be able to relax and be yourself in the context of a spiritual discussion. Something many adults can't even do well. Christ wants to express His love and concern through you. If you are always concerned about what to say next, that will be harder to express. A tool will help you become confident in the message you want to bring to your friends.
Some students react to using a tool.
The simple definition of evangelism is to announce or proclaim good news. God has called us to back up our life with words that will clarify and bring to light the reality of Christ in us. Remember, an evangelistic tool helps us in our mission to present Christ. However, it is only a tool. God is the one who draws people to Himself.