Hello Chary,
since I failed that test too, I'm going to create my own ebook with Sigil: it's a free editing software and there are a lot of tutorials on YouTube in English. I'll include grammar and Minoo's exclusive videos in my chapters. For personal use, obviously.
It's a different way to study, perfecting your grammar - this is the key to pass the test- and it will help you to remember most of the exceptions she included in the study section.
I strongly reccommend you to try it out before buying something else, please believe me, make your own ebook , importing whatever you like, images too. If you don't know HTML code, there's a WYSIWYG interface.
I wish you every success in your work