• If the paper contains 'more than one choice may be correct' type questions, then be very careful. Answer the question if you are very sure about the choices. If any choice is creating confusion, better leave out the question than gather negative marks.

• Even the idea of making wild guesses in the paper is not appreciable. So you must not do it, as it  may help you not cross the activation barrier for that  particular exam.
  

• Take a proper care of the time while answering the paper, remember you have to fill your responses carefully in the ORS as well. At times, people who have solved the questions do not manage time properly to fill in the ORS.
  

• Do fill answers in your ORS very carefully, darkening the appropriate bubble. If  you haven't filled properly, your response may not be recorded by the optical scanner
Well, maintaining mental balance during  the exam is also equally important  actually more important, to follow what all is written above. So don't ever let things create panic in your mind either before or while writing the exam.