Since Amazon owns GoodReads, the reviews on there hold quite a bit of weight with the eBook selling giant.
To get reviews on GoodReads though, you need to begin by giving reviews. Not in exchange, but to build a report with people, so when your book needs reviews you can politely ask if they might return the favor.
Always ask for honest reviews though. What is the point of getting a fake one? Do you truly want your book to claim what it’s not?
If you do get a lower review than what you expected, simply use the advice and revise your book to make it better. Then ask the same person to check it out again.