In addition, HowNet also provides the functions of cross-database selection and single database elimination. Users can select the designated database for testing, and exclude databases that do not need to be tested.
HowNet and VIP are systems used by most schools, and their databases are authoritative. Paperfree and papertime are auxiliary revision references, which provide free weight checking, machine weight reduction, online revision and other functions, covering about 70% of HowNet's data, which can reduce the absolute cost of pre-test fees. To be on the safe side, it is recommended to use the duplicate checking system required by the school or institution for testing.