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.

and then you subtract 10
from the stock COLUMN.
Breaking Bad Season 5, Episode 13

You mark "10" under this COLUMN
Breaking Bad Season 5, Episode 13

...where you have dishes in COLUMN A
and other dishes in COLUMN B...
The Big Bang Theory Season 4, Episode 20

...and if you order the dish in COLUMN A,
you can't order the dish in COLUMN B.
The Big Bang Theory Season 4, Episode 20

...where you have dishes in COLUMN A
and other dishes in COLUMN B...
The Big Bang Theory Season 4, Episode 20