Are they good enough for what? Good enough to receive credit? at most colleges, yes, but it depends on the school. Good enough to get you into an elite institution? That again would depend on the school, but it mostly would depend on the rest if your resume. What grades did you receive in the classes?
A “4” is considered “very well qualified” by College Board and would be the equivalent of an A-/B+/B.
You’re obviously an advanced student. I assume you’re shooting for ivy or MIT type schools; keep in mind as you progress throughout high school, schools won’t be impressed by quantity over quality.