As you have asked about the list of books for the preparation of the Union Public Service Commission (UPSC) Combined Medical Service (CMS) Exam, I am giving you information about it, check below for the details

Combined medical services by Rajeev kumar
Drug Interaction, Analysis & management by Hansten P. D. Horn
Combined medical services by Bhatia
Review of combined medical services by Nayak
Elsevier comprehensive guide to combined medical services
Combined Medical Services UPSC simplified Supplement by Prakash Nayak/Rajeev Kumar
Publisher: Elsevier
CBS Combined Medical Services UPSC Entrance Examination by BHATIA M. S.
Publisher: Cbs Publishers & Distributors
Combined Medical Sergical Examination by Sangita Chandra Sharad Chandra
Publisher :- Jaypee Brothers Medical Publishers

Exam pattern:

Part I – Paper I and Paper II (Question Plan)

Paper I

Maximum Marks : 250

a) General Ability
30 Questions

b) General Medicine
70 Questions

c) Pediatrics
20 Questions

Paper II

Maximum Marks : 250
a) Surgery
40 Questions

b) Gynecology & Obstetrics
40 Questions

c) Preventive & Social Medicine
40 Questions