A Master's degree is not mandatory to become an SBI PO or get promoted to a bank manager role. However, it can enhance your profile and potentially give you an edge in the competitive selection process.

An MBA can be a good choice as it equips you with valuable skills in finance, management, marketing, and communication - all of which are crucial for a banking career

Consider specializing in Finance, Banking, or Risk Management within your MBA program. These specializations will directly align with the SBI PO role and career progression in banking.

A Master's in Commerce with a specialization in Banking and Finance can provide a strong foundation in banking principles and practices. While not as directly focused on banking, a Master's in Economics can equip you with analytical skills and an understanding of economic trends, which are valuable assets in the financial sector.

Several banking-related certifications like Certified Financial Analyst (CFA) or Certified Risk Management (PRM) can enhance your profile without the time commitment of a Master's program. Focused coaching programs or online resources can equip you with the specific knowledge and skills required to crack the SBI PO exam.

Ultimately, the decision of pursuing a Master's degree depends on your individual circumstances, goals, and resources. While an MBA or other relevant Master's can be beneficial, it's not essential for success in the SBI PO exam or career advancement in banking.

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I hope it helps!