Here is a support / contrast list made by @Meynoush that can help you whether the word are signaling support or contrast:
https://forums.gregmat.com/t/new-lists-for-support-contrast-authors-opinion/18967?u=o_o
you can checkout Improve your verbal skill(do support and contrast sessions):
https://www.gregmat.com/course/improve-your-verbal-skills
This video shall give you a quick refresher on math strategy:
https://www.youtube.com/watch?v=Bdl9etFXFRk
Apart from that you need to practice the skill (Big Book is great for this)