Great tips, in a concise list. smile
For more detail, I believe these are covered in the crowd-sourced roundup of advocacy links, posted upthread.

Unfortunately, for a child who is hiding their intellect and ability, in an attempt to blend in with other students in the school learning environment, the in-school performance and achievement test results may not show the child's true aptitude/potential. If the teachers already have access to this data, and it has not alerted them to the student's need for advanced curriculum, then possibly an advocacy effort may not benefit from citing this data, alone. When a family may be facing these circumstances, possibly outside documentation may be helpful.