This Book May Help You To Learn or Improve "English"

>>Learn and practice Grammar

Well..if you've learn the language, it's time to correct your learning by using Grammar.

So, I suggest you to learn the grammar rules and practice properly.

In the beginning, you'll make mistakes and find learning grammar difficult or boring  as well. Don't forget the saying practice makes a man perfect.

It doesn't mean that you've to practice all day long. you can practiced everyday but at a certain time of the day.

Learn grammar topics one by one, if you find them too hard.

Learning Grammar with examples helps a lot and makes it easier to learn.

you can learn serially like this:

For me, learning Parts of Speech(In English the main parts of speech are noun, pronoun, adjective, determiner, verb, adverb, preposition, conjunction, and interjection) is must.

Then move to these::
clause→tense→transformation→conditional sentence →narration→tag question...

Note down the main points on your Notebook in your own way.
I think it will be fun for you, if you
can note down the Grammar rules with examples like these two pictures:
(I got these from Pinterest)

And don't forget to revise them regularly.

Remember when you're speaking with someone, you won't have time to worry about grammar rules.
So, learn and practice Grammar to fix your English by yourself beforehand.
You'll automatically understand when, what to say.

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{Note:
If you are here to learn English properly or to improve your English and understand everything I have written until now..
Congratulations, your English level is already fine. You just need to work a bit more to be excellent. Happy Learning!😁}