Less effort or less work?

I would walk if it is not far. I would take stairs if it is not more than three stories up. I would rather take a math class than an writting class. So is that less work or less effort?
My friend told me both. It's not the work it is the effort I put forward. If I really want to pass my classes I should try the same in all of my classes not just the ones I like. As for attendance if you Dont want to get dropped or fail class it would be of great importance to show up. Not only do you get attendance you get valuable information that will help you pass your class.
Lets say your having a bad day. You failed your quiz, and you studied the night before. Hanging out with someone who has a more positive outlook on things might cheer you up. Go see a movie or go to the gym.
It does help reduce the negitive mood and emotions.