To dream that you are taking a test, indicates that you are being put to the test or being scrutinized in some way. If you fail the test, then it suggests that you are feeling inadequate or insecure about some aspect of your waking life. If you ace the test, then it means that you are prepared and ready for the task at hand. There is also the notion that if you visualize success, than you will achieve success. Thus, this dream may be a "practice exercise" for you to visualize success in your real life. Alternatively, the dream may be a pun on "feeling testy" and irritated.

If you dream about taking a test or exam, you are measuring yourself up in some way.

The test itself can represent problems and obstacles that you face in waking life.

Dreaming that you are studying for or taking a test and worrying that you won’t pass can mean that you are afraid of failure. If you dream that you show up late for a test, can’t find the exam room, come unprepared, hand in a blank paper or fail the test, you could be worried about being able to handle the challenges you are facing in life. Such dreams may also indicate anxiety about sexual performance.

On a positive note, if you dream of passing a test, your unconscious could be assuring you that you have every right to feel confident about your abilities.

A pattern of forms and figures endowed with unity and significance.
It is implied in the theory of form—and is true, also, of melody—that the whole
is greater than the sum of its parts being, in a sense, their origin and justification.
If for Sartre the image is a degraded awareness of knowing, for other psychologists the image is, in fact, the highest form that knowing can assume, for all
knowledge tends towards a visual synthesis. Also to be borne in mind is the
theory propounded by Sir Herbert Read in Icon and Idea, according to which
every creation in the visual arts—and, in fact, every kind of pattern—is a form of
thought and therefore corresponds to an intelligible mental concept. This leads us
towards an intuition of the world as a vast repertoire of signs that await being
‘read’. We may note here that some of the works of Trithemius and Athanasius
Kircher tend towards this interpretation.

If you dream that you see images, you will have poor success in business or love.

To set up an image in your home, portends that you will be weak minded and easily led astray. Women should be careful of their reputation after a dream of this kind. If the images are ugly, you will have trouble in your home.