I have recently discovered a very useful website for anyone wishing to improve their grammar or writing skills. The link that follows leads to a direct page with interactive grammar and writing quizzes. The site not only allows you to take the quizzes to test your knowledge, but it directly explains the errors made and why the answer was correct or incorrect. The website was created by very reputable sources, and has contributions from textbooks, various professors of English across the nation, and specifically, Professor Karyn Hollis's Tutor Training course at Villanova University. The quizzes address several grammar issues, including pronoun usage, clauses and phrases, structural flaws, etc. However, there are also quizzes regarding spelling, punctuation, vocabulary, stylistic considerations, etc. One of the greatest aspects of this page is that at the top of it, there is a drop-box where you can select from over fifty grammar and writing rules or receive assistance with unfamiliar terms. After clicking on the specific area you need help with, you will be redirected to a page that explains the grammar term, punctuation, or writing-specific aspect, and the page will have a definition, explanation, and links to quizzes.
Here is the link to this wonderful resource:
Guide to Grammar and Writing: Interactive Quizzes