There are several free online resources available to the public.  These websites can help students who wish to review grammar, mechanics, usage and style. 

Two websites in particular are the Purdue Online Writing Lab and Grammar Bytes.

The Purdue Online Writing Lab https://owl.purdue.edu/owl/purdue_owl.html  has a variety of resources for writers of all skill levels. Perhaps the most valuable for preparing for an objective grammar exam would be the “Mechanics,” “Grammar” and “Punctuation” links under the “General Writing” link on the left hand sidebar and the “Search the OWL” dialogue box on the right hand sidebar (which allows learners to search specific lessons and tutorials).  

Grammar Bytes < www.chompchomp.com/menu.htm>  offers more specific instruction for Adult Basic Ed. Learners

Some lessons and exercises that will be useful in preparation are : 

• Comma Splices & Fused Sentences
• Fragments
•  Irregular Verbs
• Commas
• Parallel Structure
• Misplaced and Dangling Modifiers
• Apostrophes
• Pronoun Agreement
• Pronoun Case
• Pronoun Reference
• Subject-Verb Agreement
• Word Choice