My DD practised the pitch element of the aptitude test using these. I *think* she would have been OK anyway, but, as with so many of these tests, they fire out at great speed and that's not something she'd ever had to do before.
I also played some 2, 3 and 4 part chords on the piano (the texture part). She found this part the most challenging (and I wasn't sure how close together the notes would be).
Once through this part, singing pleasantly and in tune may well be enough to secure high enough marks for entry.
All the best.