How to categorize data based on values in Excel?
Categorize data based on values with If function
To apply the following formula to categorize the data by value as you need, please do as this:
Enter this formula: =IF(A2>90,"High",IF(A2>60,"Medium","Low")) into a blank cell where you want to output the result, and then drag the fill handle down to the cells to fill the formula, and the data has been categorized as following screenshot shown:

Categorize data based on values with Vlookup function
If there are multiple grades need to be categorized as below screenshot shown, the If function may be troublesome and difficult to use. In this case, the Vlookup function can do you a favor. Please do as follows:

Enter this formula: =VLOOKUP(A2,$F$1:$G$6,2,1) into a blank cell, and then drag the fill handle down to the cells you need to get the result, and all data has been categorized at once, see screenshot:

Note: In the above formula, B2 is the cell that you want to get the categorized grade, F1:G6 is the table range you want to look for, the number 2 indicates the lookup table column number which contains the values you want to return.
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