UPSC do not ask direct current affairs. It expects a student to combine current affairs with conventional knowledge. This is evident from the questions asked in last four years.
This may be for two reasons –
1. UPSC wants to kill the extra advantage that those with coaching have. You might have seen various coaching centers coming up with their weekly current affairs, daily current affairs, monthly current affairs, important issues for prelims in last one year etc. It’s very easy to mug up few such booklets. But this is not what UPSC wants.
2. UPSC wants to check the ability of correlation a candidate has – to correlate current happenings with conventional knowledge. This is what I have always said and reiterating it again – correlating whatever you read in current affairs to conventional book knowledge and vice versa is the essence of UPSC preparation strategy.