How do you Demonstrate your achievement outside of academic study?

During the last GCSE exams for students, we organise an extra classes once a week to some of the students in my church who want to sit for the exams, to help them in area they have difficulties. I volunteer to offer help in mathematics and economics, while some taken them in other subjects, we work together with them as a team, making sure time-keeping, personal organisation and dedication was one of our goals as team to help these students to achieve a good resul