Do not ever try to read the paper in detail during the initial time of first 15 minutes of reading. Out of the 15 minutes…for first 5 minutes…just go through the entire paper by reading the 1st and last sentence of the each question…so that u can get what is the basic requirement of the question and also whether u have studied that topic or not…After going through entire paper like that, mark those questions which u think u have studied and in which u can do your best.
