Hi  smile,
Refer below query.
SQL
DECLARE @tblSetMarks AS TABLE(AdmissionNo VARCHAR(10), Max INT, Mark INT, Percengage INT, Grade VARCHAR(10))
INSERT INTO @tblSetMarks VALUES('R-01',75,60,80,'A')
INSERT INTO @tblSetMarks VALUES('R-02',75,45,60,'B')
INSERT INTO @tblSetMarks VALUES('R-03',75,30,40,'C')
INSERT INTO @tblSetMarks VALUES('R-04',75,24,32,'D')
SELECT * FROM (SELECT top 1 * FROM (
            	 SELECT  AdmissionNo,sum(Max) 'Total',sum(Mark) 'Obtain'
            	 ,dense_rank() over(partition BY SUM(Max) order by SUM(Mark) DESC) AS RANK
            	 ,Round(sum(Mark) * 100/ sum(Max),1) as Percentage
            	 ,(CASE WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 90 THEN 'A+'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 80 THEN 'A'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 70 THEN 'B'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 60 THEN 'C'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 50 THEN 'D'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 40 THEN 'E'
            	 ELSE 'FAIL' END ) AS Grade
            	 ,(CASE WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 90 THEN 'OutStanding'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 80 THEN 'Excellent'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 70 THEN 'Very Good'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 60 THEN 'Good'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 50 THEN 'Satisfactory'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 40 THEN 'Work Hard'
            	 ELSE 'FAIL' END ) AS Remarks
            	 ,(CASE WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 90 THEN 'OutStanding'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 80 THEN 'His/Her performance has been outstanding.Keep it up.'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 70 THEN 'Keep up the good work.All the best.'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 60 THEN 'He/She has the potential to do more.All the best.'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 50 THEN 'He/She has been doing good in studies.'
            	 WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 40 THEN 'He/She needs to work hard in order to improve grades.'
            	 ELSE 'He/She is advised to pay attention towards studies.' END ) AS TRemarks
            	 FROM @tblSetMarks 
            	 GROUP BY AdmissionNo
) t
ORDER BY Rank ASC) s
UNION ALL
SELECT * FROM (SELECT top 1 * FROM (
                SELECT  AdmissionNo,sum(Max) 'Total',sum(Mark) 'Obtain'
                ,dense_rank() over(partition BY SUM(Max) order by SUM(Mark) DESC) AS RANK
                ,Round(sum(Mark) * 100/ sum(Max),1) as Percentage
                ,(CASE WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 90 THEN 'A+'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 80 THEN 'A'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 70 THEN 'B'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 60 THEN 'C'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 50 THEN 'D'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 40 THEN 'E'
                ELSE 'FAIL' END ) AS Grade
                ,(CASE WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 90 THEN 'OutStanding'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 80 THEN 'Excellent'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 70 THEN 'Very Good'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 60 THEN 'Good'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 50 THEN 'Satisfactory'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 40 THEN 'Work Hard'
                ELSE 'FAIL' END ) AS Remarks
                ,(CASE WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 90 THEN 'OutStanding'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 80 THEN 'His/Her performance has been outstanding.Keep it up.'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 70 THEN 'Keep up the good work.All the best.'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 60 THEN 'He/She has the potential to do more.All the best.'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 50 THEN 'He/She has been doing good in studies.'
                WHEN  Round((SUM(Mark)) * 100/ SUM([Max]),1) >= 40 THEN 'He/She needs to work hard in order to improve grades.'
                ELSE 'He/She is advised to pay attention towards studies.' END ) AS TRemarks
                FROM @tblSetMarks 
                GROUP BY AdmissionNo
) t
ORDER BY Rank DESC) s
Output
| AdmissionNo | Total | Obtain | RANK | Percentage | Grade | Remarks | TRemarks | 
| R-01 | 75 | 60 | 1 | 80 | A | Excellent | His/Her performance has been outstanding.Keep it up. | 
| R-04 | 75 | 24 | 4 | 32 | FAIL | FAIL | He/She is advised to pay attention towards studies. |