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.

Data here's a mess.
No encryption SCHEME, no order.
Westworld Season 3, Episode 8

Risky SCHEME.
Game of Thrones Season 5, Episode 4

a SCHEME devised by corrupt rulers
Game of Thrones Season 6, Episode 8

Someone who's in on the SCHEME,
who knows about laundering...
Breaking Bad Season 3, Episode 11

I don't know. It's a marketing SCHEME.
The Big Bang Theory Season 3, Episode 12