it would be nice to have some more context - written report, or spoken, more or less formal / conversational, etc., but here's a suggestion:
"It will never be the case that everyone will leave school with qualifications".
If this is for a written report, you could maybe say:
"It will never be the case that all all pupils will obtain school-leaving qualifications / secondary school qualifications.
Any more ideas anyone? fredbär? folletto? Damien?