You can check the syllabus of SBI PO with the given below link.

SBI PO Syllabus

Here are some preparation tips you can follow for SBI PO exam given below:

Firstly Make your time table for study & follow it strictly.
Practice questions with previous year question papers or sample papers.
You should give mock tests on regular basis and try to analyse their performance. Since the exam will be conducted online, solving online mocks will help immensely and boost up the speed.
Brush up basics and practice numerical problems.
Read newspaper and note down new words candidates come across to strengthen their vocabulary.
Solve word and number puzzles in newspapers and magazines for reasoning ability preparation.
The books you can prefer for SBI PO

Quantitative Aptitude:

Fast Track Objective Arithmetic (Arihant) RajeshVerma.

Quantitative Aptitude For Competitive Examinations(S.Chand) R.S.Agarwal

Reasoning:

Verbal Reasoning By R.S. Agarwal
Analytical Reasoning by MK Pandey

English:

High School EnglishGrammar by Wren & Martin

Objective General English By R. S. Agarwal and Vikas Agarwal

Or you can use Career launcher material for the preparation.

Good Luck!