The Preparation

When preparing for competition who much do we 'drill' the horse on movements?? I've heard many trainers say to only work the exercise that you will be riding.  Then I've had others say to not work the exercise but work what is required in the exercise.  For example, the half pirouette - do you work the half pirouette on the diagonal line everyday or do you just work the collection that is required to perform the half pirouette?? I'm not saying to only school the exercise at one location (between H & X) but to make sure your horse can perform the exercise anywhere in the area.  Our partner must always be on our aids and ready to listen with the least amount of pressure.  Happy Riding