Sentence completion using pairing strategy

I have started GRE prep this week and I am following Gregmat 2 month plan. I am on the pairing strategy section and i understand the strategy clearly but my only concern is that this strategy works only if you know the vocabulary. As of now I am memorising 30 words per day (following Greg’s vocab mountain), but I still know only about 90-100 GRE words.

My question is should I do these pairing strategy questions after like a month or so when i have a better grasp of the vocabulary, because rn I feel that this is a waste of practice material.

Thing is you can never do exhaustive list of vocab. Try group wise pairing quiz in gregmat+ to boost initial confidence. and then after like group 15, start with question