A suggestion is to maintain a level numbering, say ConceptA - I, and then ConceptA - II. This is how I had my subjects in college, for example, Fluid Mechanics - I, and Fluid Mechanics - II, with the level of detail and complexity increasing.

An example screenshot:

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/IW9Zj.png