Hello Aspirant,
Ideal age to prepare for banking exams is 19+ because for almost all banking examinations the candidate should have minimum 20 years of age so one should start preparing once he/she becomes 19+.
Now if you want to go for SBI posts then you can either go for SBI PO or SBI Clerk depends upon your eligibility which you can check out from the links given below :-
https://competition.careers360.com/articles/sbi-po-eligibility-criteria
https://competition.careers360.com/articles/sbi-clerk-eligibility-criteria
Follow the enlisted preparation tips for SBI posts :-
>>>>>> First of all go through the entire syllabus of SBI PO or Clerk. There are many study materials available on internet. You can take help of video tutorials available free in YouTube.
>>>>>> Read newspaper daily thoroughly for General Knowledge and current affairs. If you find it difficult to study from different books, then make your own notes. This is a good habit, your memory retention will also improve.
>>>>>> Once done with syllabus you can move on to solving mock test, previous year exam papers. Then try to figure out your weak areas and work on them.
For more details about SBI PO and SBI Clerk examination you should refer to the link given below :-
https://competition.careers360.com/exams/sbi-po
https://competition.careers360.com/exams/sbi-clerk
I hope this information helps you.
Good Luck!!
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