Minders are newbloods who are gifted with perfect memory and recall. As a result, these individuals are extremely intelligent. Every moment of every day, every face they've ever seen, every word they've ever overheard they remember. Every medical journal, or history book, or map they've every read, they understand. The same goes for practical lessons.
"Minders are gifted with what can be considered perfect intelligence, but is more likely to be perfect memory and recall. A skilled minder could, for example, read a manual on flight and be instantly able to pilot an airjet." - On Silverblooded Abilities by Victoria Aveyard