The Dover Test apparently contains NVR, VR and maths papers ( similar to those in the Kent Test) plus an English paper (comprehension, grammar and writing). The marks from all 4 papers are then added together so that it is the overall mark which counts. This means that, unlike with the Kent Test, a strong score in one paper can make up for a low score in another. About 30% of children at the schools using the Dover Test got in on the basis of that test. Others get in on HT or parental appeal, but the majority pass the Kent test.
Further details can be found on pages 18 and 19 of this document:
http://www.kent.gov.uk/committees/cabin ... -item8.pdf