Cambridge English

There are learning materials about how to take the test only included in PDF format.
A few test samples included. You have the option to take preparation test before starting the actual simulation. Unfortunately, the preparation test is the same as the simulation. More variety would have been more helpful.
The lessons are well structured and user-friendly.
There are targeted recommendations for beginners and more advanced English-learners, before starting the lessons.
Includes lessons for academic as well as general English IELTS preparation.
Summary at the end of practice tests and lessons to remind you the keywords, topics and main ideas of the lesson, to help you learn how to approach a text.
25 hours of practice materials for each test section.
Learning meant for 4.5 to 7.5 language level of IELTS.