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I gave mains this year and it was my first attempt. I would not say that the GS1 was a tough kind of paper. It can be called a bit unexpected just like the 2017 Prelims. People generally start expecting a particular type of paper due to their own inclination or the coaching effect. And UPSC makes sure that such expectations are slashed. It gives a paper which is from the syllabus but defying what the majority were expecting. This is just the part of the competition and any serious aspirant will know this and thus will prepare for several scenarios.