Verbal | Power source vs EGmat verbal

Attempted GMAT 620(49,25)

Which one should I go for ?
I need to work a lot on my CR and RC.

I have basic concepts of Sentence Correction from OG and Magoosh.

Can we avail Egmat verbal second hand ? A friend suggested something like this.

Sent from my Lenovo A7020a48 using GMAT Club Forum mobile app

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