Free eBook that provides instruction in steps, builds writing, reading, and critical thinking, and combines comprehensive grammar review with an introduction to paragraph writing and composition.
Visit the "Tutorials & Courses" tab above more a more extensive list. These can help you quickly with grammar, sentence structure, and overall organization.
"The purpose of this tutorial is to help students quickly review common mistakes made in English grammar, punctuation, organization, and writing styles. It is not meant to be a comprehensive resource on writing practices. The tutorial is intended for self-paced learning by students." From Northern Illinois University
By Joseph M. Williams and Lawrence McEnerney. "This guide is intended to help first and second year students at the University of Chicago write effective papers in the Humanities Core and Social Sciences Core."