[RadioKid]

よろしい：YOROSII;Good! would be Good!

よかった - yokatta => not good or not used in Japan in those cases.
いい - ii => 　いいね：IINE would be better.
上出来 - jyou deki => not make sense and not used
良くやった　- yoku yatta => used only in some cases when studet achive something.
良くできました -　yoku dekimashita => good for small children.
良くやったね　- yoku yattane => not used in school

I assume the teacher is Japanese. If the teacher is foreigner, "OK" would work well.