From looking at this document: http://qualifications.pearson.com/content/dam/pdf/Functional-skills/English/2010/Forms-and-administration/CBT-FS-Admin-Guide-2013-14.pdf it looks like these packages are designed to run on users' desktops, and I'm guessing that the package you have is a practice test or a past paper. Is that correct?
I've had some experience of using similar software and services from Cambridge English and they had some resources that were compatible with Moodle but not for the particular tests that we needed. I've also previewed some of Pearson's online services but haven't used them in courses.
All I can suggest is to contact Pearson/Edexcel to see if they have any packages that are compatible with Moodle and meet your learners' needs. Pearson do use Moodle, e.g. http://moodle.pearson.com/ , and they may have some materials and/or services that may be useful to you.
Maybe Mary or her colleagues have some experience with Pearson's software, systems, and/or services?
I hope this helps