Oh, I don't think it's impossible for it to be related.

I'd always presumed that practice would naturally hone our skill as well as general range of ability with the shards, but if this is the result from hardly much time for you to do on your own end, then I am ever the more certain.

[ ...or, it could really just be a consistent increase irrespective of the training, but the test had been pushing them mentally, so it stands to reason that it's probably in line with it as well. ]