Hello !
the best way to prepare your current affairs is to read news papers , watch talk shows , discuss with your teachers , parents , elder brother and sisters , friends .this habit will help you to built your opinion .
Secondly i recommend you to improve your observation,it will be very fruitful while attempting your paper. one more thing.
Make notes of each topic. for example currently the most hottest issue is that film "Innocence of Muslims" . get information about that film .like ,
1-director name 2-released date , 3-reaction of Muslims ,4-reaction of Muslim forums like OIC , 4-Reaction of Pakistan govt. etc

do this for every current topic. for example ,
1-NRO.
2-Letter to Swiss Govt.
3-blasphemy law
.
.
.

and so many others. it will just take simple 1 to 2 hr for each topic(if you have internet facility.). but after one week you will see that you are very good in current affairs ,this strategy will also help you for essay paper.


Best Regards