I personally think it depends on several things.
1.) Did you do the best you can, or did you not really bother and put any effort?
2.) What are your future plans/goals? (if you want many options, then maybe not e.g you want to become a journalist for example, the possible C in English language, but if you want to become an economist, the A* in both maths and economics could be good, but really you shouldn't be haven't such a big range of grades, for one subject, no more than 1 grade drop...)
So to answer your question, Those grades could be good enough, but also potentially not good enough.