How can an SBI Clerk get promoted to officer?

SBI's official careers page says the Bank offers fast track growth opportunities wherein Junior Associates are eligible for promotion in the officer cadre on completion of 3 years of service. That is the only official detail SBI publishes on its public careers page.

How the internal route is commonly described

SBI's promotion rules are issued through internal circulars that are not public. Education and coaching sites describe the process like this, and you should treat it as unofficial:

These sources also say the process includes an internal written test and an interview, and that successful candidates start as trainee officers before being absorbed in Junior Management Grade Scale I (JMGS-I). Rules can change with each circular.

Two routes compared

What you can do from day one

• Enrol for JAIIB as soon as you are eligible. Only serving bank employees can take JAIIB and CAIIB, and they also bring pay increments.
• Keep a clean record during probation and after - performance and conduct matter in any internal selection.
• Keep your aptitude sharp. Internal tests and the PO exam both reward the same reasoning and quant skills you built for the clerk exam.