Welcome to The Answerbank, Dee2.
There were 9 different O-level examination boards at that time (e.g. the Associated Examining Board, the Oxford & Cambridge Schools Examination Board, etc). Each of those boards offered several different syllabuses including. Further, individual schools were permitted to submit their own syllabuses for approval with the boards. So there were at least 30 different 'official' syllabuses on offer (and possibly closer to 50), plus possibly hundreds of other syllabuses that were each just used by one individual school. So you might get dozens of different answers here, with not one of them coming from someone who studied the same set texts that you did.
I was taught O-level English Literature by a newly-qualified teacher who had studied the First World War poets for his university thesis. The school submitted their own syllabus to the Oxford and Cambridge Schools Examination Board, with the texts weighted heavily towards works from the First World War. So we studied the works of Robert Graves, Rupert Brookes, etc, together with some other texts which were directly set by the examining board. (Those included the Prologue to the Canterbury Tales, written in the original Mediaeval English).