My daughter will be 11 in Sept. We have been doing Sonlight, and I have not been pushing her very hard. She is incredibly bright and insightful though. Her comprehension is awesome, but she hates to write, so I am afraid I haven't pushed too hard with the written work. I am trying to decide if I should place her in Upper Grammar or Dialectic (we will be doing TOG Year 1 starting in Sept.) I also have a son who is going to be 7 and doing lower grammar work.
I know you can switch back and forth among levels, but I am hoping to plan so that I can buy the books in advance.