>I'm considering writing the Microsoft's VFP Exams and was wondering what Study Guides or practise tests might be available in addition to Evan Delay's Study guide ?

Don't forget about Cindy! :-)

The wiki study guide is starting to disintegrate over time as topics are changed and links broken. There are tons of nuggets in there still though.
http://fox.wikis.com/wc.dll?Wiki~CategoryExam70-155
http://fox.wikis.com/wc.dll?Wiki~CategoryExam70-156

For further study materials, check out the references at the end of each chapter. The MSDN (msdn.microsoft.com) is a great resource as well.

Good luck on the exams. Let us know how you do.