Hello ankurch4
Thank you for sharing your question. I don't believe that your objective should be to 'prove' your participation. Instead, your objective should be to reflect and share with schools how those experiences have either shaped you into the leader you are today or the leader you will become tomorrow.
BTW: If you are looking to gain additional volunteer experiences for your resume that will help illustrate your leadership potential and character, please consider one of the below three organizations.
1) SCORE
2) Taproot Foundation
3) USA Leadership Corps
These organizations recruit, train, and match talented professionals like yourself with small businesses or nonprofits in need of business planning or strategy assistance. The experience you will gain will help you to demonstrate great leadership potential.
Thanks again for sharing your question. Best of luck to you.
Maxwell Roper
Outreach Director
USA Leadership Corps (USALC)
www usaLeadershipCorps org