if statement - Excel nesting error -

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another question! i'm using excel 2013 , have had create if statement chooses students grade depending on mark number (obviously nesting needed) here if statement created

=if(e2<=20,"n", if(or(e2>=21,e2<=25),4,     if(or(e2>=26,e2<=32),"5c",         if(or(e2>=33,e2<=38),"5b",              if(or(e2>=39, e2<=44), "5a",                  if(or(e2>=45, e2<=53), "6c",                      if(or(e2>=54, e2<=61), "6b",                          if(or(e2>=62, e2<=71), "6a",                              if(or(e2>=72, e2<=87), "7c",                                  if(or(e2>=88, e2<=103), "7b",                                      if(or(e2>=104, e2<=120), "7a")))))))))))

the error recieve "the specified formula cannot entered because uses more levels of nesting allowed in current file format" question is, how shorten statement allow excel use it?

place logic in spreadsheet cells. 1 column minimum score, , 1 column grade-:

           b  1      0     n 2      21    4 3      26    5c 4      33    5b 5      39    5a 6      45    6c 7      54    6b 8      72    7c 9      88    7b 10    104    7a

then vlookup grade actual score. vlookup find highest value in column less lookup value of 38.

in example vlookup below 38 score, a1:b10 lookup table 2 2nd column (in case b column) contains result (the grade).

=vlookup(38, a1:b3, 2, true)

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