Levels

He have our own system and rate all books by it, for example look at levels of different publishers:

MacMillan Oxford Penguin Our
Elementary 600 700 600 500
Pre-intermediate 1100 1000 1200 1000
Intermediate 1400 1400 1700 1500
Upper-intermediate 1600 1800 2300 2000
Advanced 2200 2500 3000 2500

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