What is a Combined Test? A Combined Test consists of any two of the three eventing "tests" (dressage, cross country and show/stadium jumping) that make up a horse trials. Usually, the two events are dressage and stadium because the costliest part of a horse trials is the cross-country phase.
Hence, your Combined Test score is the sum of the penalties from your dressage test and your stadium jumping round.
This year, GVRDC will be offering a combined test, in addition to ala carte dressage tests.