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For English language preparation, you can go through the following books for SBI PO exam:

• Objective General English by S.P. Bakshi
• High School Grammar and Composition by Wren and Martin
• Word Power Made Simple by Norman Lewis
• Essential English Grammar -Murphy
• General English - R.S.Aggarwal

You can prefer the english book for the exam preparation given below:

High School EnglishGrammar by Wren & Martin
Objective General English By R. S. Agarwal and Vikas Agarwal

Common Errors in English by Kiran Prakashan (To Practice on common errors, you can go with this book) Word Power Made easy and 30 Days more for Power full Vocabulary by Norman Lewis by Normen Lewis.

Good Luck!