勉 try hard

BEN Franklin tried hard to get his picture on the $100.

I use all my strength to get a driver's license. I try hard to do it.

To study ★★★★★
勉 (try hard) + 強 (burly) = 勉強 (To study)

To study. Used about learning a whole subject, such as Irish History or Thermodynamics. (BOOBOO: 勉強 takes months or years, as opposed to 学ぶ　（まなぶ）　which means to learn one thing, and can take a second.)