Hassan Salem wrote:What kind of discount I will get as I already bought the voucher, so I think i have one option which is passing voucher number, is it correct?
If you bought a voucher for 95 GBP,
you should indeed only enter the voucher number. The discount won't be useful. But until the end of this year you get a 20% discount when registering for a certification exam, so if you bought a voucher for only 76 GBP, you'll need to enter the promotional code as well.