I wasn't sure on buying from the internet but erpprep.com's practice exam surely gives you the confidence you need and an enviornment of real SAP EXAM before the sap exam. It also guides you how to see and read a particular question as sap exam is very tricky.
Without erpprep.com's practice test exam i would have died out of tension. the main theme which this practice makes you learn is the topics which you need to cover and the amount of depth you have to achieve in your course work.
I recommend that any one who pursues this certificate should atleast complete the course five times thoroughly and then i strongly recommend to purchase erpprep.com premium questions because they surely helps alot in your real sap exam.
I wish erpprep.com team best of luck and i hope they will soon offer professional level practice questions because i don't have the confidence to appear in the real sap exam without practicing here.
I cleared my MM certification with 90% :)