We would work if you say "It's better for we the students who agree with it."
I think this is suitable word for this sentense
Depending on the context, there are several ways to phrase the sentence.
1. For us, the students who agree with it, it is better.
(For this sentence, you are clarifying who it is you mean by "us" in between the commas. It has to be "us" because if you take away the clarifying information, which cannot stand as it's own sentence, it still has to read correctly as, "For us, it is better." You wouldn't say "For we, it is better." * I hope I explained that well enough. :)
2. We, the students, agree it is better for us.
(This only works if you don't need to distinguish between the students who agree with "it" and those who don't.)
3. It is better for us- the students who agree with it.
It is better for us to search useful english site for our our better future