How do you say

I bought a new sofa recently, which is very comfortable.

..in Chinese?

我最近买了一张新的沙发,非常舒服。

wǒ zuì jìn mǎi le yī zhāng xīn de shā fā , fēi cháng shū fú 。

How do you say "She’s been prepping for the GRE the last three months." in Chinese?