Did this around a year ago. It's a change from most other MS exams as once you've clicked finish on the question - that's it there's no going back. It requires that you read everything and then answer - make notes. Lots of notes. If you're not sure of something then re-read it. Have another look at the diagrams.
It's not easy - but it's not the hardest exam you'll ever do. Make sure you have it straight in your mind though and with Microsofts lovely way of asking questions just make sure you've read them properly.
It's a ton of text to take in. I ended up, on one of the questions, reading the question first then going through the blurb which almost cost me as right at the bottom there was something that negated that answer.
Good luck!
M.