Originally Posted by somewhereonearth
... I can't keep up... reached my limit... did not realize how quickly he would burn through material.
Have you applied to the Davidson Young Scholars program?

Meanwhile, he is at a fun age for exploring many interests and honing in on what most appeals to him and we are fortunate to live in a time when many options exist.

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"real" chemistry and physics classes
While not a complete or perfect solution,
there are many home chemistry kits which can be purchased online,
there are many virtual labs online, which may provide reasonable instruction prior to physical labs.
there are many kits, including engine kits and solar kits...
even cooking/baking can introduce science concepts.

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create and build
A few ideas, available in many areas, include:
Lego League
Odyssey of the Mind
Destination Imagination
Rube Goldberg Machine competitions
National History Day (6th through 12th grade)
There are many science contests and competitions found online.
There are a variety of Usborne children's books of things to make and do.
Many hardware stores have kids classes (build a birdhouse, etc).

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... practical part of his education that he needs
All projects can be related to math and language arts (reading, vocabulary, grammar, writing/expression).

Good luck with your speedy learner!