Coach Howard:
… Gymnasts must master skills on one piece of equipment in the beam equipment progression before they are allowed to move up to the next piece of equipment. …
Essentially in a no-spotting system, the burden to move up to the high beam falls completely on the gymnast and their mastery of the skill. …
… In our system, we have a three strike rule. Gymnasts cannot fall more than three times, when moving up though the equipment progressions, or they have to move back down and start all over again. …
read more on Gymnastics Zone – Beg Coach To Do Skills On High Beam
You need a patient Beam coach, for this.
Certainly there will be individual exceptions to “the system”.

