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This route is used in order to get the ranking of one student compared to the whole or a sub-part of the population based on the mastery. This mastery can be on all the knowledge_nodes or a subset of the knowledge nodes. 

You get a JSON response, where parameter "percent" contains the answer. It represent the percentage of users who have a better mastery than the main user. In other word, it represents the top XX% the main user is in.

===Fetch (POST)===

^ Method | POST |
^ URL | /gameplay_utils/mastery_compared_to_population |

==Parameters (*Required parameters)==

^ Property     ^ Type      ^ Description         ^
| student_id or uid | Integer or String | The identifier of the student you want to get the ranking for. |
| student_ids or uids | Integer or String | The identifier of the students you want to compare the first with. |
| knowledge_node_ids | array of integers | The id of the concepts you want to have the comparison for. |
|  | Integer or String | The identifier of the student you want to get the mastery for. |

==Get the response (JSON output example)==

<code>
{"percent": 0.8}
</code>

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