node.js - Create, Update and Delete arrays within arrays in mongoose -

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I have a schema like below. 

  course: [{institution: string, from: date, date: date, aggregate session: string, coursework: [{semestername: string, score: string, from: date, date:] }}   
 I know how to add a new course, but how do I value the value of a particular research based on the  _id  prepared by each coursework? Can I update when there are many text-list items? In addition, similarly, how do I remove a special research from the large collection?  
 Any help is appreciated ..   
 
 
 You can select an individual sub-document using the  .id ()  method. Therefore, assuming an existing course document called  course :  
  var coursework = course.coursework.id ('id- coursework');   
 This document can be deleted again:  
  coursework.remove ();   
 Note that you will have to save the parent code  course  to continue the changes in sub-documents.

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