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Note added at 23 hrs (2016-08-04 22:03:19 GMT)
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μία βεβαίωση συμμετοχής σε εξετάσεις τραπεζικών υπαλλήλων=
A certified participation in Bank personnel exams
That's how I would translate it if what you want is the above. But as you asked for 'Βεβαίωση VS Πιστοποιητικό' then as proposed (Certification v Certificate)

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Note added at 23 hrs (2016-08-04 22:05:27 GMT)
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ESS 19 Certification of employment Word - Department for Communities
https://www.communities-ni.gov.uk/.../ESS 19 Certification o...
Name of Employee ____. (CAPITAL letters). National Insurance No: ____. DECLARATION: (Please complete A or B below as appropriate.) (A) I certify that ...

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Note added at 23 hrs (2016-08-04 22:06:46 GMT)
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Teacher Certification and Employment
https://answers.ed.gov/link/portal/28022/.../Teacher-Certifi...
Elementary and Secondary Education Act ... Teacher Certification and Employment ... Teacher certification · Troops to Teachers · Answers · Request Support ...
Sample Letters: Certification of Employment from previous employer
best-letter.blogspot.com/2013/04/certification-of-employment-from.html
27 Apr 2013 - Certification of Employment ,certificate from previous employer sample, letter, work experience, format template. ... Cover letter for Preschool Teacher · Letter of Interest Cover Letter · Cover Letter for Gardener · Cover Letter for ...
Sample Letters: Employment Certificate sample - Employment ...
best-letter.blogspot.com/2013/04/employment-certificate-sample.html
27 Apr 2013 - Employment Certificate sample, format,letter, template, work experience ... Here is an example of Employment Certificate sample - Employment certificate .... Cover Letter for Elementary School Teacher · Cover letter for Food ...