Hello,

First get your concepts clear, you can start off with Grammar, learn all the important topics such as Subject-Verb Agreement, Preposition, Noun, Pronoun, Adjective, Adverb, Active & Passive Voice, Narration etc. You can go through Wren and Martin for this, Having a strong foundation on grammmar will enable you to solve sentence reaarangement, fill in the blanks, error detection etc,

You can work on your vocabulary by reading any newspaper or going through Word Power Made Easy, it's a wonderful book for vocabulary.

Once you have gone through aforementioned steps, then try solving any English Book, you can choose between Plinth to Paramount or SP Bakshi. Along with this, go through previous year papers, anaylse on a regular basis.