You can no longer manually add marks for tests which are out of print. You can easily identify out-of-print tests as they are greyed out and marked 'historic data only':
You can still view results in the marksheet and generate reports as you would for any current test series, and if you have credits left to allow your pupils to take the test interactively, those marks will be saved in the marksheet. You just will not be able to add any marks for new pupils manually, either by typing them in or uploading a CSV.