I'd go for the route of facetiously explaining that the question tests to see if they have an attention span longer than that of a goldfish. In the preceding questions they have been taken through the exact process they have to follow with a different range of data. Now, they have to do the same, but enter the corresponding months' codes and also define the ranges for the corresponding countif() and sumif() functions in order to make life easier for them. I'm also nice though - I'd make sure they understand that out of the five marks awarded for the chart they are expected to create from this data, only one mark is for actually getting the numbers right. To be fair, it does seem an awful lot of extra work for one mark, when you compare it to the marks given in the earlier parts of the paper.