Finding Unique records in multiple tables

Hi:
I have this query to match Student ID in Results1 and Results2. And display the results
Now i want to modify it to search in Results3 and Results 4 table also?
How can i do it
Further R1 appears in all 4 Results tables. Can i Show the Max R1 vaule only in one column after searching ? instead to showing R1 from all tables??

Code:

SELECT Students.StudentID
     , Students.Fullname
     , Results1.R1 AS Results1_R1 
     , Results1.R2 AS Results1_R2
     , Results2.R1 AS Results2_R1
     , Results2.R2 AS Results2_R2    
  FROM [COLOR=Red][B]([/B][/COLOR]
       Students
LEFT OUTER
  JOIN Results1
    ON Results1.StudentID = Students.StudentID
       [COLOR=Red][B])[/B][/COLOR]
LEFT OUTER
  JOIN Results2
    ON Results2.StudentID = Students.StudentID