First attempt pass (incorporating continuation from incomplete grade)

RicFischer 

I think I solved it, please check.

FirstAttemptPass Solved = 
VAR __o = "Oral"
VAR __p = "Practical"
VAR __grades =
    CALCULATETABLE (
        Table1,
        ALLEXCEPT (
            Table1,
            Table1[StudentName],
            Table1[Course],
            Table1[Stage],
            Table1[Unit]
        )
    )
VAR Result =
    SWITCH (
        TRUE (),
        CONTAINS ( __grades, Table1[Test Type], __o, Table1[Grade], "U" )
            || CONTAINS ( __grades, Table1[Test Type], __p, Table1[Grade], "U" ), "NO",
        CONTAINS ( __grades, Table1[Test Type], __o, Table1[Grade], "S" )
            && CONTAINS ( __grades, Table1[Test Type], __p, Table1[Grade], "S" ), "YES",
        NOT CONTAINS ( __grades, Table1[Test Type], __o )
            && CONTAINS ( __grades, Table1[Test Type], __p, Table1[Grade], "S" ), "YES"
    )
RETURN
    IF ( Table1[Grade] = "I", BLANK (), IF ( Table1[Grade] = "U", "NO", Result ) )

RicFischer 

This could work:

FirstAttemptPass Solved = 
VAR __o = "Oral"
VAR __p = "Practical"
VAR __grades =
    CALCULATETABLE (
        FirstAttemptPass,
        ALLEXCEPT (
            FirstAttemptPass,
            FirstAttemptPass[StudentName],
            FirstAttemptPass[Course],
            FirstAttemptPass[Stage]
            // FirstAttemptPass[Unit]
        ),
        FirstAttemptPass[CancelReason] = BLANK()
    )
VAR Result =
    SWITCH (
        TRUE (),
        CONTAINS ( __grades, FirstAttemptPass[Test Type], __o, FirstAttemptPass[Grade], "U" )
            || CONTAINS ( __grades, FirstAttemptPass[Test Type], __p, FirstAttemptPass[Grade], "U" ), "NO",
        CONTAINS ( __grades, FirstAttemptPass[Test Type], __o, FirstAttemptPass[Grade], "S" )
            && CONTAINS ( __grades, FirstAttemptPass[Test Type], __p, FirstAttemptPass[Grade], "S" ), "YES",
        NOT CONTAINS ( __grades, FirstAttemptPass[Test Type], __o )
            && CONTAINS ( __grades, FirstAttemptPass[Test Type], __p, FirstAttemptPass[Grade], "S" ), "YES"
    )
RETURN
    SWITCH( 
        TRUE(),
        FirstAttemptPass[Grade]= "I", BLANK(),
        FirstAttemptPass[CancelReason] <> BLANK(), BLANK(),
        FirstAttemptPass[Grade] = "U", "NO", 
        Result 
    )