The Great Grammar Book - Marsha Sramek
I won this book from a Goodreads giveaway and I think it is a really good book that teaches you grammar, punctuation and sentence structure. I also like the testing in the beginning, it helps to show your strengths and weaknesses, so you know what you need to work on.It's a really helpful book. I know it'll be a book I keep going back to, whenever I need help.