Apart from some dream symbols which are quite universal like the dove a symbol of peace but after, when analzing the meaning of a dream symbol is the way it relates to your own personal experience.More important is that the feeling, tone and setting of a dreams as well as its images and events all have to be taken into consideration when we are exploring the possible meanings of dream symbols and what they mean to us on a personal level.

Append below is a basic guide to Dream Symbols and its meaning:
School:

• a classroom typically represents learning but it can also mean competition or public esteem
• dreaming about being back in the classroom can indicate feelings of inadequacy especially if the dream centres around unpleasant school experiences.
• schools can also symbolize nostalgia, a desire to relive a feeling of ambition or joy from an earlier stage in life

Sea:

• large bodies of water generally represent the unconscious so the sea could indicate your emotional state
• are you feeling lost in a small boat or safe in large one? is the water calm or are you overwhelmed by hugh waves? are you afraid of monsters that lurk in the water/
• it is particular important to take note of the emotional atmosphere of the dream

Sex:

• a complex area with a broad range of meanings depending entirely on the individual
• generally having sex or seeing others having sex could be a straightforward expression of sexual desire, a desire to bond, or an indication of repressed desires for love
• dreaming about sex with someone “inappropriate” does not necessarily mean you harbor secret desires.

Slope:

• trying to ascend a slippery slope is a common dream which suggests that you are failing to progress in a certain area.
• stumbling or slipping down the slop may signify that you are forcing yourself to do things which go against your nature.

Stranger:

• in Freudian terms, meeting a stranger in a dream may symbolize meeting a part of your own unconscious personality.

Teeth (loosing):

• whether they fall out in one go or slowly crumble, dreaming of losing teeth is very common and slightly alarming.
• such a dream may reflect fear of ageing (and loss of sexual attractiveness) fear of losing poser and control or fear of change.

Tests/Examinations:

• in dreams examinations can stand for success or (fear of) failure in any area of your personal or professional life.
• sitting the examination for which you have not prepared or in a subject you haven’t studied is a classic fear of failure dream
• conversely passing an exam or test could be seen as a metaphor for having succeeded in something.

Tower:

• could be a symbol of caution and vigilance (symbolized by a watchtower) or imprisonment ( a guard tower ).
• it could also be an ivory tower representing arrogance and aloofness

Train:

• a missed train could symbolize missed opportunities in life as could being on the wrong train or missing a stop.
• travelling smoothing down the railway track may mean staying “on track” in life
• according to Freudian interpretation, the train represents the penis and entering the tunnel (representing the vagina) is a symbol of sexual intercourse.

Violence:

• horrifying scenes of vilence or destruction may represent an overwhelming fear of loss of power or control
• if you are been violent, this could represent a struggle for self-assertion or a deep-rooted anger and resentment.
• directed at you (rather than inflicted by you), violence often represents a sense of guilt and a desire for self-punishment.