"Anh ấy học."
I put "he studies", but that is perhaps too particular as one can surely learn from more than just study in the educational sense, can't one? One thing to remember is that the Vietnamese culture/economy is an agrarian one, and as such not many actually got to study anything but where their next crop came from, whether the rains would come, and whether the 3 eyed fish in the river were safe to eat!
The Vietnamese word covers both. https://en.wiktionary.org/wiki/h%E1%BB%8Dc
You learn something until you know it and you study something until you know it. "studies" does not imply reviewing something already learned, but it does imply more effort. http://www.merriam-webster.com/dictionary/studies