How can I create a new content by adding another two contents of same content type?
Entity Reference Module should be used for such cases

To use the entity reference field in views you should follow the link given below
https://www.youtube.com/watch?v=4Pdii7aFIvc
http://codekarate.com/daily-dose-of-drupal/using-views-entity-reference-module-drupal-7

In the advanced section of views you have a relationship option where you will get an option to use a referenced entity for the view of content type A(student).