When was this book written? This us of 'luncheon' makes me think the English may be somewhat old-fashioned.
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Selvakumar hear lessons till luncheonI presume it is a BrE phrase—to which this definition would apply, usually used in law but notice that it also applies to teachers:
SelvakumarHe had to reach class at about 6 am, and, after a pause for breakfast, hear lessons till luncheon, and then from 1 pm to about 5.30 pm."Is 'he' a student or a teacher? I was presuming 'he' was a teacher.
CliveI went to a grammar school in England, too,It's now basically another term for high school.They are a particular kind. Specifically, the minority of state secondary schools in the UK that select the children they take https://en.wikipedia.org/wiki/Grammar_school