learn 과 study의 차이

In English, learn means to gain knowledge or skill. For example, if you can speak English now, but five years ago you couldn’t speak English, then you can say:
I learnt English for 5 years.

In English, study refers to the process of gaining knowledge or skill, especially if you are a student preparing for an exam or test. For example, you can say:
In order to learn English, I had to study really hard.

However, when we speak about the process of gaining a practical skill, for example riding a bike, speaking in public or playing football, we use learn, not study. For example:
I had to learn  how to speak in public.
I‘m learning how to drive.

출처 : http://www.nativespeakeronline.com/confusing-words/learn-and-study

To study is the action.
To learn is the result of that action.
Saying "I studied English" means you took classes in English. It does not necessarily mean you learned anything.
(난 영어를 공부했다 라고 말하는 것은 영어 수업에 참석했다는 의미이다. 그것이 당신이 어떤 것을 배웠다는 것을 의미하지 않는다)