The participant of the training chooses not a yacht, but a convenient class of service / comfort, which directly correlates with its size.
The specific yacht is determined by the yacht school on the eve of the voyage based on the number of those who signed up and the need for seasonal or symptomatic maintenance of the particular vessel.
This is really a training fleet - only the school instructor is responsible for any damage to the yachts during the practical classes!
Pupils are responsible only for the loss of objects separated from the yacht (winches, fenders, buckets, etc.) and damage in the cabin (having burned the table with a kettle, tore the curtain, etc.)