Expand your world. Find your passion and learn more than just what is in a textbook. The world is full of problems that don't have an A,B.C or D option. People live in various realties. Find something to speak about and practice it often.

to be self confident is to be sure of yourself /or having trust in your abilities ( about doing something , about what you know etc) eg why dont you try ? You should be self confident . Dont be so self confident because the exam may not be as easy as you think