This isn't an idiom because you can figure it out by the context. People look good "on paper" because they only list their best qualities on their resumes, but when you meet them in person, you may find that they are not so nice or so qualified.
This is not an idiom. It means exactly what it says. The company that this person keeps is not a good group of people.
The meaning of the idiom in the pink of health means being in good health.
It means useless.
"Your poor paper" means it wasn't a good one, it was sub-standard "Cannot hold a candle" is an idiom meaning "is nowhere close to," or "is far below in standard" "Her excellent one" refers to a paper that was superior
To feel A1 is to be in good health and happy with life.
Chicken is not an idiom, because an idiom is a phrase. Chicken, meaning afraid or cowardly, is a slang term. Slang is when you have a word (sometimes a couple of words) that local people use in a different way from the accepted meaning. Americans call someone 'chicken' not because they are domesticated birds that lay eggs and taste good fried, but because they act afraid.
It means you did your best and were honorable; you didn't cheat or anything.
It means: "whatever happens, good or bad"
The phrase "Eavesdroppers will never hear any good of themselves" basically means that people who eavesdrop, or people who listen in on conversations, will only hear people saying bad things about them behind their back or without them knowing.
it means you've done a good job. You should be proud.
Yes, the word 'distinguished' means to stand out, be exceptionally good, or something of high quality.
"Kindle" is the small fire to start a larger fire, as every girl-guide or boy scout knows. The idiom means to start the person's inner, deep drives, so that eventually the results are visbile outside the person. The idiom describes the actions of good parents and good mentors.