70-300 exam format

I am planning to take the 70-300 very soon. Can someone
please explain the format.
1. How many total questions and what is the alloted time?
2. Are all the questions case studies? If so how many of
them?

I don't seem to find much info in any of books or the
microsoft site. I will greatly appreciate any kind of help.

Thanks very much,
RSG

RSG