Guys:

I started preparing last week by reading Rita 7th edition. 

Prepartion time: One week , No sample tests needed

Just read through the Rita prep book. Understand the meanings such as Informating gathering techniques, risk methods. Practise EVM , CPM

Get the logic...Dont use your instincts in anwsering. Instead assume in a ideal PM world.

Take a quick 60 question test. Go back and do a quick read on Rita book again.

Schedule test and take it immediately. 

My two cents.