If I have been involved in an activity for 11 years, can I put on my resume 1st-12th grade or should I just put 9th-12th grade and let the AO assume that Ive done it for a long time due to some national awards?
If you’re not required to check boxes for each grade I’d write “11 years” instead of “1st - 12th grade.” It’s an honest answer and shows that this activity has been important to you.