Practically speaking schools represent places of learning. The level of schooling provided (elementary, high school, college, university, etc) can certainly have an impact on the specific meaning of the symbol within any particular dream. Generally speaking being in school will represent the need to learn something or relearn something. If a person finds themselves in a school that is beneath/above the level that would be expected of their age, it often indicates the need to relearn something or an advanced ability to understand something.
* Symbol meanings provided by www.mydreamstories.com should not be used as a dream dictionary. They are for reference only and both dreamer and interpreter should be careful to listen to the voice of Holy Spirit as to what any particular symbol means in any specific dream