We have loved out-of-the-house writing classes, and many homeschoolers supplement with online options. And these days there are quite a few of those options! Below are a few of the most highly recommended for kiddos struggling with writing.
Write Shop  has curriculum grouped for all age levels. Complete curriculum runs up to $130, but they offer bulk discounts and have sales and better rates on individual books. There’s also a placement test so you know where to start.
With Outschool  you can sign up for free and classes start for as low as $10. These are live, online classes that meet at scheduled times, multiple days a week. They offer standard writing courses per grade level, as well as short classes based on fun interests, like the Percy Jackson  and Wings of Fire  series. There are so many classes to choose from here, you can really take your pick!
Essentials In Writing  has a writing curriculum available for purchase, as well as online classes. The online classes include college prep and a special course for struggling writers! They also offer a literature curriculum made to go hand in hand with the writing portion. Each is available individually to stream or as a DVD package. You can also bundle them for a better price.
IEW  or Institute for Excellence in Writing is a higher cost than the options above, but the comprehensive curriculum is rich and immersive. This is an excellent tool for your homeschool arsenal.
Copy work is another great option for struggling writers. You can read all about the benefits and uses of copy work here !
For even more great options, check out these other fabulous, free writing and grammar  resources, as well as this collection of free writing printables , and creative writing ideas and prompts .