She sounds like an older version of my dd so thanks for the heads up that it won't get easier
She is very independent, often flies off the handle, definitley has to be right and gives up easily if she thinks she cannot do something, but will persevere for ever if she is really interested in something (eg loves reading about animals)
She is starting Beavers next Jan - I think she will love that better than Rainbows as she is a real tomboy, and already likes the idea having looked on the website at the badges etc.
She has just started piano lessons but i will look into other instruments - at present she is quite happy but I would like my ds to learn and he is very impatient ... However i saw some fab digital painos which can play the melody with you which might help?
I think the boredom comments could be spot on - my dd's behaviour is good in the first term of teh year as she is finding her feet and is stretched, but by the summer term she is dreadful as they wind down / revise.
I am clamping down hard on behaviour (she is 5) but I tend to agree that the older they are the more they need to feel in control, even at 5 my dd needs to have some control over her life (control freak like her mother ). I think the exercise idea is good, even if it just getting her out on a bike in the summer evenings, or maybe a modern dance class. And others have said, definitley talk to the teachers in more detail about the issues and how the situations arise then you can agree an action plan.
I am interested that she is the oldest - is there a small age gap? My dd is less than 2 yrs older than ds and i think sometimes she resents him being around (subconsciously) and would fare betetr as an only child, much as she loves him and likes company! Also being a summer child (Gemini) she has a lot of dominant traits that seem to come out.
Sorry not much help, hope you get something sorted