Nonsense, these bonus points only exist on paper, they are never applied. I went to all Irish primary and seconday, and took my leaving cert(honours) through Irish. The hilarious thing was that three of my friends, in english schools, with poor Irish got higher marks than I did in Irish. Hilarious!
Also honours physics, which I sat, I got a whole grade lower, a 'C', even though when I tallied my answers with the answers from paper, I was borderline 'A'. So, sorry the bonus never applies. Really you should get 10% of the marks you did not get. i.e. If you got 70% in your exam, you would be due 10% of the 30% you did not get, i.e. 3%. So doing your exam through Irish would bump you up to 73%. That is how is works I believe. The bonus should be kept and should be applied, but it is not generally,
AFAIK.