Originally Posted by Khezar

First of all, scoring trends change almost every year so changing a subject just because of low scoring trend is not a good strategy. Secondly, such trend does not mean that everyone scores low as is evident from high scores by some aspirants in the US history.
Choosing btw anthro and psych will depend on your academic background and personal inclination. I dnt know about anthro, but psych can pitch you good marks, however, its not an easy subject. You will have to allocate a good chunk of your time to it. I will advise you to stay with sociology if you have already started preparing it.
Lastly, I law complements IR somewhat and goes well with it. You should go through the syllabus of both the subjects and have a look at at least 3 past papers, it will enable you to make a sound decision.