Learn how to say O-Levels correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word O level:
[mass noun] (in the UK except Scotland) a qualification in a specific subject formerly taken by school students aged 14-16, at a level below A level. It was replaced in 1988 by the GCSE.
[count noun] an O-level exam or pass.
1940s: short for ordinary level