MySQL GROUP_CONCAT with -ve values

Is there an option to make MySQL's Group_Concat function include -ve values and zeros ?

Consider the following example from my source table:

Id, question, mark
10, 3, -10
10, 4, 0
10, 5, 2
10, 8, 1

When I query on the selection table for rank calcultaion with GROUP_CONCAT, I get the following:

Id, question, mark ,rank
10, 5, 2 ,1
10, 8, 1 ,2

I would like to get the following:

Id, question, mark ,rank
10, 5, 2 ,1
10, 8, 1 ,2
10, 4, 0 ,3
10, 3, -10 ,4

For reference, my query looks like this:

SELECT  *,FIND_IN_SET( mark , (    
        SELECT GROUP_CONCAT( mark 
        ORDER BY mark DESC ) 
        FROM exam_score )
        ) AS rank
        FROM exam_score
        ORDER BY rank asc