Learning English from the first point

I'm so disappointed with my English lately -particularly grammatical point- and decided I'm gonna restart studying from basic of language. "words"and "idioms".
These two are absolutely necessary for every language.

What is simple is what is hardest...TT

Now ,I grabbed bunch of text book from shelves at shop.
Hope I'm not satisfied with just get them, but study hardly.

An English exam waiting me in March , little bit getting nervus I am ... lol