Don't think that hanging a mirror on the door, turning on the gas and sticking an erotic picture on the bedside can really help you not to fail the exam?
The biggest function of feng shui is not to change the weather, but to make people feel comfortable. Your heart has been messed up. Do you have a bad omen in your dream? Have you seen blood recently?
Heaven returns to the public, yin and yang rotate, and the devil comes from the heart. If the heart is peaceful, everything will be safe; if the heart is restless, it will be haunted by demons.
If you feel afraid of the dark and can't sleep at night, light a desk lamp handle, put an opener under your pillow, give yourself some psychological hints, and make yourself feel powerful to resist, and the world will be very simple.