Marc, dreams can be powerful. The dreamer is the interpreter, with perhaps a little help grabbing the symbology that carries the message. Dreams have turned my life around in the most positive way. I am a student of Jung, who has guided me well in dealing with dream life.
You know your dreams aren’t literal. Repetitive remembered dreams are especially important. The fact they are generally pleasant may indicate you are not dealing with heavily suppressed information, but none-the-less the unconscious has a need to deal with something in a more conscious way.
I’d suggest you look to connections - what do the dreams remind you of? What images come to mind, no matter how unrelated it might first appear? Do they remind you of remembered history? Feel free to explore. Anything that comes to mind might be relevant. What does school stand for? What does repetition of prior class work indicate? This may be a broad subject unrelated to actual events. The classwork might be regarding subjects unrelated to your prior classes. It could possibly indicate you are now being shown an entirely new course of learning to support a new and important activity for which you are uniquely qualified. Perhaps counseling of some sort? - a wild guess not intended to direct YOUR interpretation).
I will not speculate too much about meanings. I only emphasize the need to escape literal interpretation and look at the symbols for what they might stand for.
Sometimes important info is found in minute details. Follow the connections that come to mind, however far out they might first seem, then just follow your feelings. Surprises are bound to occur when you are on the right trail. After all, this is unconscious information, not what you are familiar with. Some new and important understanding is being offered to you.
Do not let anything I or anyone else says color YOUR interpretation. It will be more feeling than logical, and again, perhaps quite surprising.