Wrong Result of IIF function in MDX

I have written a query as mentioned below:

WITH 
  SET [kpi_study] AS 
    {[study].[study].[BHC June12]} 
  SET [geographic] AS 
    {[territory.market_hierarchy].[state].[HP]} 
  SET [brand] AS 
    {[brand.brand_hierarchy].[brand].[Gold Flake (Unspecified)]} 
  SET [edu12] AS 
    IIF
    (
      'All' = 'All'
     ,[education].[education].MEMBERS
     ,[education].[education].[All]
    ) 
SELECT 
  NON EMPTY 
    {[Measures].[tom]} ON COLUMNS
FROM [funnel_analysis]
WHERE 
  {[kpi_study]*[geographic]*[brand]};

Result:Tom:4.19

Instead of All if i am passing(SSC/HSC) any other value always getting same value.Can any help me where i am doing wrong.it means IIF function is not working proper.

You have the following:

 SET [edu12] AS 
    IIF
    (
      'All' = 'All'
     ,[education].[education].MEMBERS
     ,[education].[education].[All]
    ) 

So I'm guessing All are placeholders ?! - and you say when you change one of them nothing happens.

This is because in your select you're not actually using the SET called [edu12] so why would anything change?

SELECT 
  NON EMPTY 
    {[Measures].[tom]} ON COLUMNS
FROM [funnel_analysis]
WHERE 
  {[kpi_study]*[geographic]*[brand]};

Is [edu12] supposed to be on rows?