You're right, these are all common dreams. It's curious that people often have dreams of forgetting to go to class, or not having studied for a test, or similar school failure dreams, many years after leaving school.
The two dreams of being "frozen"--you can't move your legs to run or your jaw to speak--remind me of the fact that in sleep our muscles actually are temporarily paralyzed, which makes the phenomenon of "sleep paralysis"--where your mind seems to wake up but you can't move your body--so scary. I wonder if your dreams could be somehow connected to that stage of sleep, which seems to be between sleeping and waking (or between waking and sleeping!). That is, as in sleep paralysis, you may be starting to become aware of the literal paralysis of your body, but instead of waking up, your mind is incorporating these sensation into a dream narrative. If this is true, then your dream probably does not have psychological significance but may merely be associated with the physical condition during sleep. But the fact that these dreams are recurring does suggest some underlying anxiety.
So, obviously these dreams could express worry or a lurking "inferiority complex," in contrast to your conscious waking attitude of self-confidence and the good feeling of knowing that you are fabulous. It's possible for us to feel two opposite ways at the same time--we can have self-esteem in some areas while also fearing that we may not be good enough in other ways. The interesting thing is that in my experience of observing people and reading books about Jungian psychology, most people are not aware of both these opposites at the same time; usually they only experience one or the other. For example, a person who consciously feels inadequate may not be aware that underneath that feeling, he actually thinks quite a lot of himself. I like the fact that your question shows that you are aware of both sides of yourself, since this is relatively rare. To be able to hold opposite feelings in your consciousness (such as "I love you, Mom" and "I hate you, Mom") without freaking out is a mark of maturity.
Do you really have some ability to lucid dream? if so, then a good suggestion for you (which I read in a book called Patterns of Dreaming by James Hall, MD) might be this: Try to introduce into your dreams the thought "This is only a dream." This may help to counteract the anxiety of those recurring dreams. The author did not say how to do this, but I would do it by forming the intention and repeating it to myself before falling asleep. The intention is that if I dream about not being able to move my legs or speak, or about failing my class, I will become lucid and tell myself that "This is only a dream."