To cover Current affairs objectives, you need a multi prong effort . Only reading dawn can fetch you 5 to 6 marks for sure but not 17 or 18.

You should learn by heart

1) all the annual international days and events.
2) new books and novels published .
3) Stay upto date with all UN and related developments
4) Names of new theories and ideas , for example what is "barrier free " concept ( came this year).
5) Nobel prize winners of last 2 decades and why they got he prize .
And You general knowledge , well that contains all what is left .