Get into Cambridge to study what? Depends entirely on that.
Generally though, you should try to improve your English grades to 8s and same thing with maths. Otherwise, your grades are fine (the more 8/9s the better). At this stage though it doesn't make sense to talk about grades for Cambridge, because GCSEs will likely not be a deciding factor - A-Levels, Entry Tests, Interviews, etc. will hold far more weight. But if you wanted a yes or no answer, as long as you improve them slightly, yes your grades should be good enough provided the rest of your application is up to Cambridge standard.