Have you tried filtering it? Just select column B, click the filter button, then check all the A, B, and C boxes.
If you want a formula, here are 2 options:
Excel 2012
| A | B | C | D | E | F | G |
---|
Name | Grade | Passers | Score above: | B- | Grades | | |
Amy | A | Amy | Bob | F | | | |
Bob | B- | Bob | Erica | D- | | | |
Claire | C- | Claire | Fred | D+ | | | |
Dan | D | Erica | Irene | D+ | | | |
Erica | A+ | Fred | Kelly | C- | | | |
Fred | B+ | Hal | | C | | | |
Ginger | F | Irene | | C+ | | | |
Hal | C- | Kelly | | B- | | | |
Irene | B+ | | | B | | | |
Jack | F | | | B+ | | | |
Kelly | A- | | | A- | | | |
A
| | | | | | | |
A+ | | | | | | | |
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[TD="align: left"]=IFERROR(
INDEX(A:A,AGGREGATE(15,6,ROW($A$2:$A$20)/(LEFT($B$2:$B$20)={"A","B","C"}),ROWS($C$2:$C2))),"")[/TD]
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[TH]D2[/TH]
[TD="align: left"]=IFERROR(
INDEX(A:A,AGGREGATE(15,6,ROW($A$2:$A$20)/(MATCH($B$2:$B$20,$G$2:$G$14,0)>=MATCH($E$1,$G$2:$G$14,0)),ROWS($C$2:$C2))),"")[/TD]
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The first has the A, B, or C hardcoded in the formula (following +/- sign ignored). The second lets you put an arbitrary grade in E1, and selects the grades that are higher in the grade list in column G.