I see free (from) is more proper in this regard.

Kind Regards

If you wanted it to have the feel of a young kid, you might like to go for something like:

"I wish I kud fly laik a bird. Then I kud escape from maths, teachers and skool!" - of course the bad spelling may be overkill. It would still work with standard spelling.

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Note added at 1 hr 49 mins (2005-10-21 12:51:04 GMT)
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While I generally agree with Mikhail's comment IF this is supposed to be said/written by a child today, I can imagine many scenarios in which a *mature* (whether in terms of age or mentality) child would say/write just such a thing. Without knowing the greater context (age and location of the child, modern day/18th-19th century), I wouldn't want to dismiss the possibility.

I agree with everyone else that there are few if any settings in which a child would speak as in your example. "I wish I could fly away and not have to ...." gets at the concepts of "flight" and "freedom" in language that is a bit simpler and probably more childlike.