Possible scenario:

 1. A student has two accounts created for him or her. They need to be merged into one so that they only have one account.


Solution:

Determine the main account. This one will be the one with grades entered in it. 


1. Determine the account that is going to be the main one. 

2. Determine how much information is in the second account. All information will be added to the first account from the second manually.