Hi Laura,
the fact that they put the top quartile together is good, IF they will give you a single grade skip and then subject accelerate as needed.
I would also reccomend:
1)IQ/achievement test with Julia Osborne, and read her Assessing Gifted Children at http://www.hoagiesgifted.org/assessing_gifted.htm

2)consider moving to be near the gifted school, if it would work for your kid, or organizing a carpool if a taxi would get your child there more quickly.

3) Apply to private schools, even if it means needing financial aid.

Best Wishes,
Trinity

Coaching available, at SchoolSuccessSolutions.com