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Grammar is about 50 questions on the HESI A2, and it is the section where a weekend of focused work moves a score furthest. The reason is simple: the content is finite. There are only so many ways to test subject and verb agreement, and the exam uses most of them repeatedly.
The recurring error types
Subject and verb agreement. Usually disguised by distance. "The box of files is heavy", not are, because the subject is box, not files. Watch for prepositional phrases dropped between the subject and the verb.
Pronoun reference and agreement. A pronoun must clearly point at one noun. "Each nurse must submit their form" is common in speech and still tested as an error in formal usage.
Verb tense consistency. A sentence that starts in the past should not drift into the present without reason.
Modifier placement. "Running down the hall, the chart fell" says the chart was running. The exam likes this one.
Parallel structure. Items in a list must share a form: reading, writing and speaking, not reading, writing and to speak.
Commonly confused words. Their, there, they're. Affect, effect. Fewer, less. Among, between. Lie, lay. Accept, except. Principle, principal.
Parts of speech, because the questions name them
Some questions do not test usage at all; they ask you to identify a part of speech in a sentence. Be able to spot a noun, verb, adjective, adverb, pronoun, preposition, conjunction and interjection on sight. That is an afternoon of work, not a week.
Read the sentence aloud in your head
For usage questions, the ear catches what the eye misses, with one exception: the errors that are common in speech. "Me and her went" sounds normal to many people and is wrong. So use the ear first, then check the specific rule for the two options you are left with.
Why this section repays effort fastest
Sciences reward months. Grammar rewards a weekend, because the rule set closes. If you are short on time and need to move a cumulative score, this is where the cheap marks are, and taking them is not a compromise.
The TEAS equivalent covers the same rules from a slightly different angle: TEAS English and Language Usage.