Seeing the ace in a deck of cards suggests an ambiguity in your life. You need clarity. Specifically, the ace of hearts means that you are involved in a love affair. If you see the ace of spades in your dream, it means that you are involved in a scandal. If you see the ace of diamonds, then it symbolizes your heritage or your reputation. And if you see the ace of clubs, it indicates that you will be involved in a legal matter.
Alternatively, the dream can be a metaphor for being an “ace”. Or the dream is a pun on “taking” a test.