Adding dynamic and multiple fields for user profile using profile2 module in Drupal 7
Old question, but I have to say that Ankit's comment was on the right track. Install and enable Field Collection, because you will use this to group each instance of your education details fields.

Depending on whether or not you use Profile 2, create a Field Collection-type field at /admin/config/people/accounts/fields or /admin/structure/profiles/manage/&lt;profile_type&gt;/fields. The number of values for the field collection field should be greater than one or unlimited. Finally, create your education details fields at /admin/structure/field-collections/&lt;field_collection&gt;/fields.