It won't get carried forward in the form of your exam certs, but if you need the extra time, take it.
It will not be told to college, unless they ask or you tell them, which you may want to do so you get help that you may need next year. Needing extra time in exams is not as negative as it seems. I have a friend who is dyslexic, so got 25% extra time in exams, even though she was an A* student (ended up with all A* and A grades).
Having extra time will not get you an A* if you do not already have the capability.