To dream of entering a contest, suggests that you are relying too much on fate instead of taking responsibility for your own actions/decisions.
To dream that you win the lottery, represents your inner desires to live without having to worry about financial and material troubles.
To dream that you receive a prize, denotes that you have made significant progress towards personal goals.
[1]Dreams of a contest represents inspiration to be your best combined with a competitive spirit. Perhaps you are comparing yourself with someone in your life; striving to win and be number one. This dream may indicate that you are under the false impression that you are either better than the people in your life or less than them.
See Also: Goddess Athena, Competition, Sports, Carrot.
[2]Parts of yourself vying for some reward.
[3][4]See Also: Fight(ing)
[5]