The first book of the Life of Fred Language Arts Series. This series covers English for high school students and in Australia it covers:
Seven billion = 7,000,000,000 
Indentation to begin paragraphs
Three punctuation marks to end a sentence
Punctuation began common usage around 1450 (with the invention of the printing press)
Two to the third power
Subjunctive mood used much more frequently in German, French, and Latin than in English,
Postscripts
Picoseconds
Six question words (who, when, where, why, what, and how)
State abbreviations
Correct way to hold a pencil
Plurals of words (two cases)
Irregular plurals
Finding your calling in life
Opening and closing salutations
Only the first word in a closing salutation is capitalized
Australia is between the Indian and the Pacific oceans
Silent letters
Islands vs. continents—the four questions to ask
Homonyms
Topology and more