Classhook uses a letter system for rating the content level of the material. These letters represent the general grade level that the content of each clip is best suited for. For example, a clip for Kindergarten learning level would be rated with a K, or a clip for college learning level would be rated with a C.
The full list of the levels and its corresponding symbols are shown below:
These letters are shown below every entry. Below is an example:
For this clip, the E, MS and HS squares show that this clip is appropriate for Elementary, Middle, and High School Levels.