Make Certificate and Mail Merge in your domain.

This add-on will enable the user to create a CERTIFICATE to the number of users based on the given spreadsheet and template slide. The prepared certificates will be stored in the Google Drive inside the created folder with e-mailing them as pdf to each user. Or you can only save them in your google drive without e-mailing them if you did not specify an e-mail address.

You can add various details to the certificate from a spreadsheet columns. This includes:

 Full Name, 
 Course Code, 
 Exam Score,
 E-mail Address,
 Month

Prepare the Spreadsheet Columns as:
 
Full Name	Exam Score	E-mail Address	Course Code  Month

Set the name of the first sheet as Sheet1 and the second sheet as Email Template
																		
You need to add the required field in the template slide as:
{{FullName}}
{{CourseCode}} 
{{ExamScore}}
{{Month}}


To send a subject and body mail, then all you need is to put them in cell A1 of the second sheet (Email Template) , you can add the name of the user as ${"Full Name"}.

Updates (v3):
Create another folder for saving copies of the certificates as pdf.

Updates (v2):
you can write your E-mail template in the way you want. 
You can prepare your certificates and send them by e-mail and save the copy in your Google drive Or you can only save them in Google drive without sending any e-mail, if there's no written e-mail address. 

This is a spreadsheet add-on, that means using the CertiMerge can be done by installing the add-on using a spreadsheet.