If you dream of making a bet it shows the gambler side of yours. There is a possibility that the subconscious mind of yours is giving you a warning, not to take the risks to something you are not sure of. Make sure you use the knowledge at particular situation, think twice before making a deal at professional level or even at the decisions of personal life. It is hard to stay critical to yourself, but consider that only you can criticize your actions better than anyone else and/or give the best advice.
Read more about dreaming of Bet in other dream meanings interpretations.