International bodies, specifically related to India are  very important for both  preliminary and mains exams. But one thing is important to say here that we are not going to do the PhD  on these topics as these topics are very vast so no irrelevant stuff will be covered.

Look at some 2015 Prelim questions,

Q.1 India is a member of which of the following?
1. Asia-Pacific economic corporation.
2. Association of South-East Asian Nations.
3. East Asia Summit
Select the correct answer using the code given below.
a) 1 and 2 only
b) 3 only
c) 1, 2, and 3
d) India is a member of none of them

Q. 2 In the Mekong-Ganga Cooperation, an initiative of six countries, which of the following is/are not a participant/ participants?
1. Bangladesh
2. Cambodia
3. China
4. Myanmar
5. Thailand
Select the correct answer using the code given below.
(a) 1 only
(b) 2, 3 and 4
(c) 1 and 3
(d) 1, 2 and 5

Q.3 With reference to ‘Indian Ocean Rim Association for Regional Cooperation (IOR-ARC)’, Consider the following statements:
1. It was established very recently in response to incidents of piracy and accidents of oil spills
2. It is an alliance meant for maritime security only
Which of the following statements given above is/are correct?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2


In this way, it seems that they are more focusing on factual part, but nothing can be said about the future, so both factual and analytical part will be covered sufficiently.