Tbh, I find it difficult to look at low scores in the intro tests as being a reflection that the test is too hard, rather than a(n accurate) reflection that your riders are beginners. And its OK to be a beginner - we all were once upon a time. (And even experienced riders get bad scores from time to time!)
We have some littles from our barn who show intro/training. Are they on the bit? Nope. Do they make mistakes? Yup! Do we have some judges who are probably a little harsher than we’d like them to be? Sometimes. As long as your students are competent enough to be safe, who cares if they’re getting high scores?
So you got a 50%. Next time you might get a 60, or you might get a 45. IMO, as long as you’re safe, it’s OK if you don’t get the score you hoped for. It’s OK if they’re competing against experienced riders who are scoring higher than them. It’s OK to tell your students, “Hey, you’re still learning. You came out and gave it your best shot, and it’s OK to be disappointed. And now we can see what the judge said, and we can learn from it, and work on doing better next time.”
Whether any of the above is done in a barn, schooling or rated show is irrelevant. It’s OK for people to fail from time to time. Good horsepeople are resilient, patient, and willing to take the highs with the lows. Not to mention that there are SO SO many ways you can reinforce someone at a show who is a beginner besides a single score from a judge.