Only one piece of advice Focus on Repeated Topic (>70 % Repeat) + solve latest 5 years UPSC CMS Q paper. if possible go through individual subject wise book focus on topic which is common in all subject like Tuberculosis, Chromosome Disorder,contraception etc .These kinds of topics are more likely to appear in the exam. (nearly 100 %). DO NOT STICK TO THEORY ONLY. MCQS PRACTICE IS MUST TO CRACK EXAM . eg. surgeon need surgery.