Picture it from your son's point of view. He has wonderful ideas running through his head: toys he wants to build, games and characters he wants to invent, and problems he'd like to solve. Instead, he's made to sit quietly, learn about subjects that are meaningless to him, and remember facts that are both boring and irrelevant to a seven-year-old. I think I'd squirm a little too!
And now, these facts that were too boring to learn during the day will be forced upon him at night. Your family time together will become a battleground. Yes, with enough struggling, you'll eventually make him learn the particular fact or figure, but what is the cost? Will this help him love learning? Will he see learning as an exciting part of living or as something quite repulsive being thrust upon him each day -- and now at night, also?
Many moms across the country have faced this problem and have turned to homeschooling as an answer. There are currently almost 2 million homeschoolers in this country. Homeschooling provides a safety net for boys just like your son. Rather than stifle or eliminate that creative energy, homeschooling encourages and nurtures it. He sounds like a bright little boy who would flourish in a homeschool environment.