As my comment, can’t say whether they are helpful or not. Use with careThank you a lot for share your experience, so should I just buy set 6 and set 7 ($35 each)? You said the set tests are easier than the real tests for which part? I also searching for some videos on youtube to teach how to write the writing parts, is that helpful?
The practice is easier for all parts - like 80% of real test. The main benefit as I mentioned is familiar with their tone. That is really a big advantage.