you should solve grammar exercises one by one rule , paragraphs respectively after that you should read correction ( correct incorrect ) and solve that's exercises then you will be able to get a very very strong grip at grammar rules with correct sentence structure


there is one book

To the Point by professor Aftab Ahmed OF B.A level . this is very nice and advance level Pakistani book after that read Cambridge book >> English_Grammar_in_Use

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I know who am I but here is still need to know what am I ? (A.N)