i second this concern, same scenario here. This is really not discussed anywhere, not mentioned in the act itself, not even media I mean apart from asking a lawyer which would probably not happen because the act has not passed yet, I really do not see any other way to find out about the SSS.
I know in the sss site they mention how they go to public high schools, but they never went to mine, and trust me, my school is small enough that I would have known.

I mean you have to go to a post office to just pick up their application, this is the technology age, the only reason we step into a post office is to ship a text if we did not get it on e-book format or because we sold something on ebay and need it shipped (at least that has been my case).