Regarding .NET Cert Exams

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Hello Friends,

First post so sorry if anything goes wrong.
My company is providing educational assistance upto £500 for certification/courses etc. I'm planning to utilise this for my wife and she prefers to do .net cert. I was checking the path and I feel the approach is
a. Exam 70-536: TS: Microsoft .NET Framework – Application Development Foundation
b. Exam 70-562: TS: Microsoft .NET Framework 3.5, ASP.NET Application Development

My query is
1. Can I buy these certification exams as vouchers? and then my wife can register for exam using these vouchers?
2. What all are the methods to purchase/register for the exam in the UK?

Thanks in advance