new delhi after successfully introducing changes in the civil services preliminary examination two years ago the union public service commission upsc will this week come out with a notification bringing crucial changes in its main examination the change coming into effect from this year will give more weight to general studies by introducing new papers replacing optional subjects idea of such a move is to ensure that all candidates are judged on the basis of indepth knowledge and understanding rather than information gathered at the last moment the notification is most likely to come out on thursday or friday said a senior official the civil services examination cse which is meant for selecting candidates for elite central services like ias ifs ips irs and others has three stages comprising preliminary main and personality test interview the upsc which changed the preliminary examination pattern in 2011 by infusing elements of aptitude test had brought a minor change in the main examination pattern last time in 1993 when it introduced an additional paper of essay now aspirants have to appear in two optional subjects two papers each besides one paper on essay and two papers on general studies the commission has so far temporarily withhold issuance of a notification for this years civil services examinations which was scheduled to be notified on february 2 the commission however later said it could not notify the cse due to some unforeseen circumstances