Your dream is actually a painting, and "I", "headmaster" and "fish" are all elements in the painting. Fish means "fruitful" in traditional culture. You can easily catch fish with a spoon, which shows that you are very capable in some way. The headmaster symbolizes a standard and norm, representing your evaluation and affirmation. Perhaps this is the real purpose of your dream-insinuating that you may be treated unfairly in life: for example, you have the ability to do a job or something well. But you don't get the recognition you deserve ... this kind of thing is very common in life, maybe you don't care, but we will leave some emotions when we go deep into our hearts. If this emotion accumulates too much, it is a kind of harm to you, and you will find opportunities to express it, and reckless dreams are the best occasion to express this emotion.
What does the dream phoenix symbolize? Although I didn't see her true face, it seems that it has nothing to do with fish, but it is not. It is related and closely related. This is a sign of your confidence, which probably means "It doesn't matter whether you cheat or not, but sooner or later, gold will shine, or the phoenix will fly …".
Among them, 250 and 258 are not random. I believe they contain deeper meanings, because I don't know the present situation of your life, so I can't give it a real symbolic meaning. Think about your life after a while, and you will get the answer. Because none of the elements in the dream are redundant, they either symbolize something or indicate something.
According to my present understanding, if you link the moral of your dream, it is equivalent to these two sentences: "The headmaster is really a 250, and he ignores my ability, so I will have a bright future", and when you find Phoenix, it is when you find yourself, or "The headmaster treats me as a 250, just wait and see, and I will prove it to you (I will send it).