As you have been a model pupil you have never stayed after school before - had you any inkling of what really went on at the school you would never have stayed until the end of the day. After dark your school undergoes a horrible transformation. Familiar objects turn nasty. Death stalks the school corridor. Will you escape with your life?
Included in the Adventures for your ZX Spectrum book by Clive Gifford; which was also translated and re-released in Serbia and the Netherlands.
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This game is not written by David Estall but by Adam Waring. It says so in the the English and Ducht Version of "Adventures for your Commodore 64" written by David Estall.
That matches the message printed in the Yugoslavian edition (!) of Clive Gifford's book... although there he's credited as "Adam Vering"... so I'll alter the author in line with your suggestion.