"High school students who plan to take the ACT must first master a number of grammatical rules for the English section.
For many students, grammar is a dreaded subject, but it is a central portion of ACT English. Conventions of Standard English accounts for 51-56 percent of this section score, versus 29-32 percent for Production of Writing and 13-19 percent for Knowledge of Language.
Here are four major areas of grammar that students should understand fully prior to completing the ACT English section." …