UPSC CSE preparation demands not just being aware about the News related to any topic published on a particular date, but also everything related to it that was in News in the past some time or will be in News till the exam date. This is known as maintaining track of ‘Backward/Forward Linkages’ related to all the current affairs topics. Also, there are instances when for some subjects you need to keep updating your study material in sync with the happenings taking place at present.