=IF(NOT(ISERROR(FIND("A",A1,1))),"小学生",IF(NOT(ISERROR(FIND("B",A1,1))),"中学生",IF(NOT(ISERROR(FIND("C",A1,1))),"大学生","数据有误")))
=IF(ISNUMBER(FIND("A",A1)),"小学生",IF(ISNUMBER(FIND("B",A1)),"中学生",IF(ISNUMBER(FIND("C",A1)),"大学生","")))
E1 A 小学生
B 中学生
C 大学生 F3
B1=VLOOKUP(A1,$E$1:$F$3,2,0)
=IF(ISERROR(FIND("A",A1)),IF(ISERROR(FIND("B",A1)),IF(ISERROR(FIND("C",A1)),"无","大学生"),"中学生"),"小学生")