A few weeks ago, I was reading books on Kumon Method. At the back of a book, they showed a sample curriculum for Math and English for North American continent.
In particular, I checked to see how many worksheets they used per year and per subject. And I noticed that moving in English from very simple sentences to rather elaborate sentences took about 400 sheets times 5 years plus 200 sheets times 1 year. It totalled to 2200 worksheets.
I couldn't help recalling how I had journeyed across that distance with nothing more than 6 or 7 A-4-size grammar notes of my own, based on a few grammar books I read in those days.
Do we need 2200 or do we need 20 worksheets?