@Former Member posted:I think it was the fourth or fifth standard.
I started high school at 14. I wrote it when I was 12. It was abolished in 1962 after my batch and was replaced by another one called Preliminary Certificate of Education. The headmaster asked me if I want to write the exam even though I started high school and I did. I passed that too.
I do think it's fourth , I can recall writing Preliminary Certificate of Education at fourth standard ,after that the next was College of Preceptors written at Form 3 ,then GCE "O" and "A" Level.