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Pro Tip: If budget is a constraint, consider buying the (used) from a senior. The core physiology has not changed; only the exam pattern integration has. You can supplement the old edition with the new CBME competencies downloaded for free from the NMC website. Ak Jain Physiology Pdf 9th Edition
If you have the means, buy the hard copy. It is an investment in your career. You can highlight it, make notes in the margins, and it saves your eyes from the strain of staring at screens for hours. If you searched for hoping for a free