I looked for it in dictionaries, but it doesn't seem to be a standard verb, except in a few cases where it means to run someones name through the police systems. Perhaps it's slang?
очень хочу прокачать мои знания по английскому
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Sign up to join this communityYes, it's slang. Качать means pump. This word (by my opinion) came from bodybuilders, who pump theirs muscles. Today this word got wide meaning as improve something. Прокачать игрового персонажа в Wow. - pump my hero in WoW. Phrase in question mead "I really want to improve my English skills".