There are now a bunch of screen-test videos of Freddie Stroma (Cormac McLaggen in Half-Blood Prince) online. You can watch them HERE and below:

The Rest of the Videos:

Prodigy 1 | Prodigy 2 | Prodigy 4 | Prodigy 5 | Prodigy 6 | Love At First Hiccup 1 | Love At First Hiccup 2 | Life & Death At 17 |
Life And Death At 17 2 | Life And Death At 17 3Note: Some of the videos contain strong language. Also, it is unknown whether or not these screen-tests were for his role in the sixth Harry Potter film.

Thank you SS!