I realise that each person has his / her own way of approaching a MS exam.
My previous method has worked OK for 70-271 / 70-272 and 70-290
i.e. answer all questions as they come, awkward ones mark for review if unsure, ones you are certain of - leave unmarked for review.
At the end of the exam - review the ones marked for review and then press finish button to reveal Good or Bad News.
This method failed on my last attempt at the 70-270:
finished 50 questions in 1 hour, took 1/2 hour to review ones marked for review, pressed button - failed on 654 marks 

 - Had 1/2 hr left for further reviewing if necessary.
Do you think its best to go with your gut feelings on answered questions or do you review ALL questions just in case you may have overlooked something - I am aware of the need to avoid reviewing good answers and amending them to wrong answers.
Any thoughts, my re-sit is on Tuesday AM
thanks