The series is suitable for both Academic IELTS preparation and General Training preparation.
As the name suggests, each book contains a 15 days plan to prepare for the IELTS test. The authors start each book with a brief explanation and a general overview of the module and what is the format of it.
Then, in the next days, they explain each task and discuss each type of question, giving examples and tasks to do.
Also, 15 days’ practice series, contain real IELTS exams to answer it to be familiar with the real exam.