DAX needed

Hi sravani9920 ,

You need to add the class on your solution:
Power Query:

• Class must be added to the Group By and Merged queries steps:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WKi5KLEvMy1TSUSpJLS4xBNIBicXFQMpQKVYHXdoIv7QxkE5LzMxBks7MK8U02hhD0ghDMrMIt5sQcpgOQsgZo8vl5mcXZyA7B8WtKLIgcwtw6jXGK2uCLosziI3wBzFQOhYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Name = _t, #"test " = _t, #"Pass/fail" = _t, Class = _t]),
    #"Uppercased Text" = Table.TransformColumns(Source,{{"Pass/fail", Text.Upper, type text}}),
    #"Grouped Rows" = Table.Group(#"Uppercased Text", {"Name", "Class"}, {{"Status", each List.Min([#"Pass/fail"]), type text}}),
    #"Merged Queries" = Table.NestedJoin(Source, {"Name","Class"}, #"Grouped Rows", {"Name", "Class"}, "Grouped Rows", JoinKind.LeftOuter),
    #"Expanded Grouped Rows" = Table.ExpandTableColumn(#"Merged Queries", "Grouped Rows", {"Status"}, {"Status"})
in
    #"Expanded Grouped Rows"

Calculated column:

Status DAX = 
VAR temptable = FILTER(
		SUMMARIZE(
			ALL(Grades),
			Grades[Name],
            Grades[Class],
			Grades[Pass/fail]
		),
		Grades[Name] = EARLIER(Grades[Name]) &&
        Grades[Class] = EARLIER(Grades[Class])
	)
	RETURN
		MINX(
			temptable,
			Grades[Pass/fail]
		)

Dax measure:

Status per student = VAR temptable = SUMMARIZE(
			Grades,
			Grades[Name],
            Grades[Class],
			"@status", MIN(Grades[Pass/fail])
		)
		RETURN
			COUNTROWS(FILTER(
				temptable,
				[@status] IN VALUES('Status'[Status])
			))

File attach