At the bottom of each dressage test are collective scores called Gaits, Submission, Impulsion and Rider. All of these scores are doubled and are very important to the outcome of the riders overall score. Each of these aspects is evaluated in every movement of the test.
Submission is defined in the USDF Glossary as [...]

Many events are won with the dressage score. You need to prepare and go for the lowest score possible by riding an accurate test. Work at home on your geometry so that it becomes automatic. It is very important to know how many strides your horse has in each gait for the [...]

Preparing your horse for his first event takes planning and preperation. Set up a training schedule to include at least one day of jumping and one gallop cross country with several days working on your flat work. Remember, the basics of your flat work transfer to jumping both cross country and stadium. [...]