Are you no longer hungry or thirsty? Your life has been improved.
If you skip the oil change and your car breaks down, your life sucks. The oil change improves your life (or, rather, prevents a reduction in your living conditions).
Just because your "Life is improved slightly" does NOT make your LIVING condition go up.
No it's not. Living condition is a physical thing, like "homeless" or "living in a house". Living Standard is how comfortable, fed, etc. you are in that place. That ones all about mentality.
Like, a homeless man would be considered to be in "Bad Living Conditions". But if he always wanted to sleep in a hammock an get away from people, then his standard of living is still at a comfortable level (since it's what he is comfortable with). Even though his living condition isn't good.