Salam

These are the books suggested to me by my teacher.

Made Easy Series by Afzal Anwar Mufti ( For Grammar )
1000 Words Vocabulary by Jahangir World Times
CSS Vocabulary by Jahagir World Times.

You will get enough content for your essay if you prepare other subjects well enough.

واللہ تعالی اعلم

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Victory is always possible for the person who refuses to stop fighting.