How do you say

I’m going to buy new clothes for the trip next month.

..in Chinese?

我打算买件新衣服,下个月去旅行穿

wǒ dǎ suàn mǎi jiàn xīn yī fú , xià gè yuè qù lǚ xíng chuān

How do you say "The students are preparing for their final exam." in Chinese?