Hyy Rachit, 

As such there are no common pattern of these questions, so my suggestion to you would be to prepare from the link given below, it has selected synonyms and antonym which generally comes in all competitive exams

http://www.qmaths.in/2016/11/synonyms-antonyms-pdf-download-for-all-competition-exams.html?m=1

But remember that "more is less".. That means you have to prepare as much as you can on your part,

If further doubts, do comment 

I hope this helps