how should one prepare for SBI po initially through books at most starting level?

Start from the Reasoning ok likke :
Sitting Arrangement.
Puzzle Test.
Syllogism.
Data Sufficiency Problems.
Blood Relationship Problems.
Series Problems.
Input- Output/ Sequential Output Tracing.
Direction Sense Problems.
Statement Assumption/Conclusion/Arguement/Course of Action.
Ordering and Ranking.


and then go to the English topic :-
Reading Comprehension.
Fill in the blank (Vocabulary based problems).
Sentence Correction / Spotting error (Tenses, Part of Speech, Active and Passive Voice, Subject Verb Agreement).
Para jumbles.
Antonyms/Synonyms based problems.

and later on Aptitude