Great source for practice

Gmat club is one the best sources to study for gmat and these practice tests are great tools to simulate and practice for the real test. Reviews, comments and discussion session also enrich this tool and allows to dive deep in some of the contents of the questions.
The test is s very flexible and allows differents formats for studying or practice. It also allow to change difficulty, choose specific type of questions and sections.
Another positive aspect is the huge question bank which contains many of the questions from official sources.
In order to improve, gmat club should eliminate low quality questions. That would greatly improve the overall quality.