Teach Like a Champion 2.0: 62 Techniques that Put Students on the Path to College is BY FAR THE BEST CLASSROOM MANAGEMENT BOOK I HAVE EVER READ (and it also has a ton of helpful advice for lesson planning and assessment). Seriously–if you don’t own this book, you need to buy it. Right now.
6 + 1 Traits of Writing: The Complete Guide, Grades 3 and Up is a perfect introduction to the 6+1 traits of writing, and it includes a ton of student writing samples, rubrics, and excellent advice for teaching these traits to your students.
English Composition and Grammar: Complete Course, Benchmark Edition is pretty old-school, but the exercises and step-by-step instructions are fantastic for students who need the writing process broken down clearly and simply. I love the structure of the book, though I tend to update the exercises with livelier examples for my students, and it’s important to integrate these lessons and exercises with longer, more independently driven writing projects.
Ereadingworksheets has a ton of resources for the reading comprehension side of your ELA class. I like to use the practice worksheets for differentiation, giving students extra work on the specific skills they have not yet mastered.