You, of course, be able to speack about the topic which will be interesting for you. Don’t do the mistake of trying to cover too much ground in a brief talk. Just take one or two angles of a subject and attempt to cover them adequately.
Think about the topic every free time. Discuss and ask questions of your friends about your topic and try to improve it with thier advices.
Think about your troubles. What are difficult for you? What are easier?
Speak about the interesting cases of your topic, because you may weary your listeners. Be specific!
