A skill set that is information management oriented is highly sought after by employers.  Microsoft Office applications, being a world standard, are as important to a work environment as any other technical skill. 
 
The Microsoft Office Specialist - Excel certification allows you to demonstrate their knowledge of various applications through hands-on testing.  The MOS certification involves individual exams for each application:  Excel, Excel Expert, Word, Word Expert, Outlook, PowerPoint, Access.  Offered in 2019 or 365 editions, each exam leads to a significant credential. 
 
You get online access to the GMetrix learning system, 1 attempt at the exam + 1 additional attempt in case  you did not pass the first time.
 
Note.  The +1 rewrite attempt is not refundable if  you pass the first time.