The more advanced the training session is, the higher it will cost. The cost of training a skill up can be calculated as follows:

• Levels 15–50: 10 * [skill level] + 50
  
  
• Levels 51–75: 30 * [skill level] + 50
  
  
• Levels 75–90: 50 * [skill level] + 50

This cost is based on the skill level after all modifications. So for example, Speech training while wearing an Amulet of Dibella will be priced at a level 15 points higher than the raw skill level. It is thus best to remove relevant equipment before training.

Trainers that are also merchants, such as Arcadia in Whiterun, add the gold paid to them for training into their inventory. One can easily recover gold spent on training by selling them items. The gold can also be pickpocketed back from the trainer, albeit difficult if it is a large amount.

The proficiency of trainers varies:

• Adept trainers can train up to level 50.
  
  
• Expert trainers can train up to level 75.
  
  
• Master trainers can train up to level 90.

Once the Dragonborn's skill level is greater than or equal to the trainer's level, the option for training disappears as there is no more that can be learned from this person.

You can look on https://elderscrolls.fandom.com/wiki/Trainers_(Skyrim) if you want more info about skill level developing from trainers. If you like this guide please give a upvote.

♦ 🤙Please Like or give Award if you benefit from this guide.