It is very important to keep track of time while preparing for GMAT and specially while practicing questions. GMAT is a timer test and gives approx 2 mins for each question. I've developed an application to keep track of time when practicing gmat tests/questions during self study. It is a free app. This is my way of giving back to the internet GMAT community. Find out more at:

https://amitkpandeyece.blogspot.in/2013/ ... timer.html