If you scored far worse than you expected then part of your problem is likely to be exam technique, dealing with the questions and the test format, rather than that you simply don't know the material. And you will now have an advantage because you've seen it before. I suggest you revise the material one more time then do lots and lots of practice exams, and when you are scoring consistently in those go for the test again.
Failures makes a man strong and helps him to clear his barrier.
Well you can now understand what type of questions are asked and also quite awarw about the question types, like Create a tree, Drag and drop, Active screen type.
The key to success is to do exhaustive study and then go for more and more simulation questions and practice sessions.
This will help you to judge your knowledge and ultimately prepare you for the exam.
Hope this would help you to clear your problem.
Don’t worry I also unable to clear my exam 70-290 in first attempt. This failure realized me that only having knowledge is not enough. Practice is equally important. Before taking my second attempt I practiced with practice exam as much as possible. I used uCertify’s simulation exam and find it is excellent for practice. I am also suggesting you, revise the material you have and do lots of practice with practice exam.
Thanks for your suggestion and I followed your footstep, finally landed up to ucertify.com. Downloaded their free questions. their questions were above average. But the study notes are excellent and had helped me to develop some concept on user accounts, group accounts, and various command-line utilities.