Hello candidate,

Being able to speak and communicate in English is one of the most important thing which a professional needs in his job life because most of the the corporate deals and talks are done in English language, and hence you need to be good at it.

Here are some of the free sites of your help-

FluentU: Learn English Through Real Videos

Rosetta Stone: Learn English in Context

MindSnacks: Make Vocabulary Studies Fun

Memrise: Remember New Words Easily

Babbel: Take Bite-sized English Lessons

Mosalingua: Learn Practical English

Busuu: Learn English Speaking

Hope it helps!