Question

For what reason village school master is still remember

Answer 1

The most remarkable thing about the village schoolmaster is the amount of knowledge he has.  He is very smart.  The author lets us know this by describing all the things he can do:

The village all declared how much he knew; 'Twas certain he could write, and cipher too: Lands he could measure, terms and tides presage, And e'en the story ran that he could gauge

The village schoolmaster could write and do arithmetic, of course,...