The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

No ELITE unit
will be able to tell the difference
Money Heist Season 1, Episode 8

{\i1}Five ELITE agents{\i0}
Money Heist Season 3, Episode 6

I don't need to be a member of
the most ELITE magical society
The Big Bang Theory Season 12, Episode 10

So, Howard, you are
in an ELITE group.
The Big Bang Theory Season 12, Episode 5

of spreading the video of
your ELITE commando singing "Bella Ciao."
Money Heist Season 3, Episode 6