That young is quite sanguine about the result of his competitive examination.

depressed : (of a person) in a state of unhappiness or despondency.
pessimistic : tending to see the worst aspect of things or believe that the worst will happen.
anxious : feeling or showing worry, nervousness, or unease about something with an uncertain outcome.
optimistic : hopeful and confident about the future.
sanguine : optimistic or positive, especially in an apparently bad or difficult situation.


Synonym of sanguine is optimistic