Naval Academy

I abondoned/aborted the Artillery tutorial by mistake and want to re-sit the exam. However, when I go back to try again, I have an 'Unsatisfactory' rating and if I try and re-do it, I have no ammo.

Is there any way I can re-do it? I don't even mind starting Academy all over again but I'm not even sure how to do that because the existing ratings for Nav and Artillery still seem to show up.

Would appreciate advice/help.

Cheers

KC