First of all, I added immigration section to my reading list to do some initial reading/research for my dissertation ideas. Immigration was not my main consideration for the field exam. I was concerning about religion in sociological thinking, modernity, modernization and secularization theories. I primarily added immigration to learn what is going on the current literature. I did some reading and it was useful for me.
I was planning to write 3-4 pages a short essay for immigration section in beginning. But, over time I noticed that writing 3-4 pages is really difficult and not enough at field paper level because developing some meaningful ideas/arguments require more pages