Row level security in Power BI services

Hello ,
 
What i want to report  is rank of schools on the basis of number of students.(Higher the count, top on rankings)

I have published my report to power BI services , report is being seen on the basis of Row level security.

Row level security is implemented on the Schoolid , Let's say School with user Schoolid = 1 will able to see data only for school with id=1 

One of the measure ranks school amonst schools on the basis of number of student as mentioned above. But when user with Schoolid = 1 logs in , report do not have all data to evalute rankings. So ranking is being calculated on the basis of filterred data Schoolid = 1 . Which obviously will rank always 1

Rank Measure formula :  RANKX(ALL(table[Schoolid),[Total student],,0,Dense)

Is there any way that i can achive above requirement with the same Row level security by changing something in above formula?

Or i need to make this calculations before row level security comes into picture?

Please guide further on this.

Thanks