Wonderful Websites That Offer Grammar and Punctuation Review
Purdue's Online Writing Lab offers lessons on Grammar, Punctuation, Spelling and Sentence Structure. If your instructor notes problems in any of those areas on your papers this semester, then this might be the quickest way to try to remedy those problems.
Here is another really good site to help you better understand basic grammar. It contains information and exercises, and many students have reported learning a lot from the online lessons and handouts.
This is a really helpful addition to your Chrome browser that will check for grammar and spelling problems in your writing. It's much better than many of the word processors. It can be used as a stand-alone word processor or as a Chrome extension to check the content you're typing online.
A short lesson on commas and semicolons