Did you ever find out what topics are covered in 7/8th grade math? If not perhaps now is the time. I would them ask them very pointed questions as to what particular subjects they are worried he would have gaps in?
The math coordinator in my district really fights the trend for more and more kids to take Algebra early. Not a lot of parents I know like him. He feels that too many kids are taking math too early, and find themselves in problems in High School when they can't keep up. What he does do to try and prevent this is to make his tests about abstract thinking.
