84% is a ludicrous score and it is likely the judge is not approved, registered nor would s/he have any credibility in most dressage circles.
Focus on watching your videos and working with your coach and ignore the silly scores that some judges insist on giving out. I've ridden horses up to an international level, with good results and national championships and have never gotten a "9" from a reputable judge.
Generally speaking if it's your first 5-6 years of competing and you get anything over about 70% be very skeptical and do not accept "9" and "10" scores without a fairly large side dish of salt.
I agree completely with Kayty, an 80%+ at intro under a reputable judge even for the best trainers on the nicest horses is very far-fetched. Let alone someone in their first dressage competition.