AoA!

It would not be wrong to say that FPSC targets different subjects each year. IR was targeted in year 2017 ,and this was the the reason no aspirant got in top 10 having IR as an optional. However, a less can be done in this regard. In my view IR can be a low scoring subject but it may not become something that could not be cleared. We should focus on increasing our strength in IR and other subjects. Do give good attention on covering MCQs ,and this regard I would recommend you to download MCQs app from playstore and get a book/notes of past paper MCQs.
Goodluck!!
Best regards