Hock, I think the attached does what you're looking for. The easy way to get there is to right-click-drag the date field to the filter shelf, which will popup this diag box:
Click Years and then Next and you'll get this diag box:
Select 2013 and you'll get the filter you're looking for.
PS: That rt-click-drag was something I picked up from Joe Mako way back when.
StudentTest-SW.twbx.zip 13.0 KB
Your solution leads to the following result.
I wondered if there is a quick way to show the grades of the filtered students across all the years as shown below:
One way is to create a group or set of the above four students but this is quite a tedious process when there are a large number of students.