This language is very important, in particular in the work's world. This language is very important, in particular in the work's world.

I would say "in a workplace setting."

This language is very important, in particular in the work's -world. This language is very important, in particular in the work-world.

This language is very important, in particular in the work'sld of worldk. This language is very important, in particular in the world of work.

"the work's world" wouldn't be said grammatically, as work is uncountable so doesn't take a "the" Even at that, "work's world" sounds unnatural - "world of work" is a common idiomatic phrase that gets used and would be expected to be used here, even if by basic grammar rules they are equivalent.

SMOOTHER: This language is very important for many people in Japan, in particular in themany work's woring fields. SMOOTHER: This language is very important for many people in Japan, in particular in many working fields.

For me it's so difficult to learn the language, any types of them. For me it's so difficult to learn the language, any of them.

For me is soI find it difficult to learn thenew languages, any types of themespecially English. I find it difficult to learn new languages, especially English.

For me is sot is very difficult to learn the language, any types of them.language For me it is very difficult to learn any type of language

"so" isn't a generic emphasis word, it has specific patterns where it can be used (e.g. "so X that I Y").

For me is so difficult to learn the language, any types of themany foreign language. For me is so difficult to learn any foreign language.

However I'm very good in mat Math and scientific subjects. However I'm very good at Math and scientific subjects.

However, I'm very good in math and the scientific subjectces. However, I'm very good in math and the sciences.

However I'm very good inat math and scientific subjects. However I'm very good at math and scientific subjects.

"in" is acceptable grammatically, but "at" is much more natural for this context.