Hello,

It's never too late, you can still start your preparation, just follow the steps mentioned below:

Get acquainted with the syllabus, the core areas of banking remains the same, Quantitative Aptitude, Readoning and English,especially in the first stage, later on there are Mains, descriptive test , in case of clerk interview doesn't happen.

The level of Probationary Officers are comparatively higher than that of Clerk.

For Quantitative Aptitude, you can refer NCERTs book for conceptual understanding, later on go for standard books such as Arihant Objective Mathematics, M Tyra Quicker Maths, R K Agarwal Quantitative Aptitude for Competitive Exams, if you're preparing for PO, you can refer How to prepare for Quantitative Aptitude for the CAT"by Arun Sharma(the level of quant is very high here)

For Reasoning, you can use MK Pandey Analytical Reasoning/RK Agarwal Verbal and Non-Verbal Reasoning.

Coming to English, you can useWren and Martin Bookfor Grammar,Word Power Made Easy by Norman Lewisis a good book for vocabulary building, for practice purpose use Objective General by SP Bakshi. Read The Hindu on a daily basis, nowadays RCs are taken directly from here only, this will improve your language skills, vocabulary and knowledge.

Use Internet extensively, there are many banking exams preparation sites which provide free mock papers for each of above section, even if you don't have books, note down the syllabus and make a timetable to devote certain hours to those subjects, take one topic,in case of reasoning and quanit, gain conceptual understanding and practice thereafter.

Hey Ankit

There is no reason of getting stressed at the age of 21. just think how passionate you are that you started preparing from 2017. Many student start preparing after 23-24 or even more so you have enough time in your hand. And if you feel you are weak then follow our course designed by experts.

Check the link

https://learn.careers360.com/jobs/sbi-po/

good luck