This dream may symbolize your feelings of being divided or separated from your friends or loved ones. The three groups in the dream could represent different aspects of your life, such as work, family, and friends. The fact that your friend was in a different group may suggest that you feel distant or disconnected from them in waking life. However, the last day of school and your friend joining your group could symbolize a reunion or reconciliation with this person.
The appearance of Mrs. Damaris as a new teacher could represent a new authority figure or influence in your life. The fact that you were playing on your computer and the volume wouldn’t go down may suggest that you are struggling to control your actions or emotions in a situation where you feel pressured or judged. This could be a reflection of your fear of making mistakes or being criticized by others.
Overall, this dream may be highlighting your desire for unity and acceptance, as well as your fear of being judged or rejected by others.