I just passed HSK 4! When I planned to take HSK level 2, my teacher Amber in my Chinese school used the HSK Standard Course (HSK 标准教程) to help us prepare for the test. The result showed that the serials were really helpful. All of us passed the test. Afterward, I continued to study with this HSK Standard Course series and passed HSK level 3 and 4 smoothly. It`s suitable for all self-taught learners and the students who want to pass the tests. “With HSK test papers as its primary source, HSK Standard Course is characterized by a humorous style, familiar topics, and a scientific course design. Matching the HSK test in all aspects, from the content, form to the levels, it is a series of new-type course books embodying the idea of combining testing and teaching, and promoting learning and teaching by testing.”
Highly recommend to study with DigMandarin’s HSK One Stop Courses alongside HSK Standard Course
Update(2019/5): I was notified from Blcup that the downloadable is not allowed, I changed the link to Amazon.