What can a student do if a professor makes special allowances for one student in a course? In one of my software engineering courses, the syllabus includes two exams (midterm + final), daily quizzes + participation mark, spot quizzes and a group project.

A lot of us asked the professor to drop the midterm and add more weight to the project because we all wanted to build a beautiful project, so eventually we can also add it to our resume. The response was that it would not be possible to drop the midterm but the weight might be reduced, but would have to think about it. (Fair enough).

However, a week later we found out that one of the students in class got exemption from writing midterms, daily quizzes and spot quizzes. That student only has to worry about the project. We asked how this is possible and we learned of a special deal with the professor. So basically when the group projects begin that student will in charge of holding group meetings with different groups and providing feedback to the professor on their progress. So since they have a lot of "workload" they won't be writing quizzes and exams. This option was never mentioned by the professor when the class as a whole asked her to drop the midterm.

So I am wondering, is this legal or even possible? There are a lot of international students in the class too that are simply scared to speak up. I feel it is not fair that one student is exempt from doing all the work. 

What should I do? Just keep quiet and mind my own business? 

This is a Graduate Computer Science Program.

Additional Details

In the first two weeks the other student wrote quizzes like everyone else and the professor was not happy with the grades of quizzes of some people (everyone except this one person had good marks), so it will be worth a little less. Eventually a week later the student stopped writing quizzes after making this special deal. 

I have great relation with the Department Chair and I am also working on a project with them, I am not sure if I should bring this up in our conversation.
The arrangements that the professor makes with any other student are absolutely none of your business. I don't see any indication that your grade is threatened. If you are learning what the course aims to teach, it is not your place to second-guess the way that your professor chooses to run her class. 

Faculty are often asked to make accommodations for individual students for any number of reasons, and these reasons are not to be made public. In fact, I'm required by law both to offer alternative forms of evaluation where appropriate, and not to explain why I am offering the student an alternative form of evaluation.

For a US perspective, read up on the ADA and FERPA and you'll see an interesting intersection of required accommodations and required privacy on behalf of students with special needs.

[Comments converted to answer by request.]