As upsc pre just held on 18.06.2017. One thing i had noticed this year too was in csat paper 2 there is section called comprehension in this questions anwers makes huge differences specially on small passages. E.g. analytical reasoning ,critical intereference,logical reasoning etc.questions likes that has different answers in different institution answer keys and after one year upsc answer key is anything else. so there is no clearity on these questions and answers. we should raise this issue on national level.