Hey that's okay. Don't think that you should've achieved xyz things at this age. It's purely ok. Don't get depressed. It's better to begin even if late rather than doing something never. So stay positive get motivated, smile and start a fresh beginning. The time you start of doing something is the perfect time to reach youur goal and forget about what happened. Yes it's good if you start preparing for the SBI exam soon. The harder you work for something, the more easier it will get. Don't let your mind kill your confidence. So stay motivated and start preparing for the examination.

Refer to this link below to know more about the SBI PO examinations..

https://competition.careers360.com/exams/sbi-po

Refer to the link below to get some tips and tricks for the exam..

https://competition.careers360.com/articles/sbi-po-preparation-tips

Best wishes. Thank you.