One of the benefits of working in China is that I get a lot of time to follow other interests such as writing.
I have been teaching IELTS speaking over the last few years and if you remember I did publish a book a few years ago in Beijing.
This time however, I have published one myself on Kindle. Again it is about how students can do well in their speaking test so a pretty niche marketplace - but at the same time their are many many students who need the IELTS qualification to enter a foreign university of a professional job in the English speaking countries.
I just did a free promo over the last weekend and over 70 copies of the ebook were downloaded.
Here's the link if you want to look on Amazon.