ESF K1 application: Supporting doc regarding Alumni

Hi all,
My son is currently enrolled in Abacus K2. I am about to start the application for P1.

I am an ESF alumni having graduated from Sha tin college 20 years ago hence have higher priority over students enrolled at ESF kindergartens.

Does anyone know what they deem as acceptable Alumni evidence As you can imagine my report cards are LONG GONE! (nor do i want to be reminded of my crappy grades :) )

I do, however, have all the class year books from Year 7-13 with my photo and name on it....not sure what else they consider.

I will call them and ask sometime next week but thought someone here would know.

Thanks.