Hi Niti Shah  Marketo used to have a practice test but I think this option is not available anymore.

This is the second time I take the exam, to keep your certification active, I believe you need to sit for the exam every year.

Here are some tips that I posted regarding the Proctored Test: Preparing for you MCE - Online Proctored Mode

I did not take the MCE Preparation course but I believe it is a very good idea.  I know the topics that I mentioned in this course are covered there.

Good luck on your exam!