When you have a clear target, you’ll have a clear roadmap on how to get there. If you are studying without clear targets, you are like a boat without a rudder — directionless and unmoored. Like what Bill Copeland said, “The trouble with not having a goal is …
… brain hates when it constantly drinks from a firehose that is spewing vast amounts of information. It is not designed to be a massive storage of information. When you do, you experience fatigue and decrease in productivity.