In my honest view, i wouldn't wish no more than 10 exams on anyone one, straight A student or not. Because at the end of the day, exams can be stressful and the amount of revision needed can burn people out.
Me personaly, i got my crucial resist out the way this january and i see 8 or 9 exams as enough for me, but 10 is the line that i don't want to reach.
In my honest view, if you are well orginized, hard working, dedicated and revise from till your exam, you have a good chance of doing well across the board. But the fact that you came on here to ask if 14 is too many, might suggest that you doubt is a sign that you don't think your capable? and if so, i wouldn't risk it.