Dear  Sri ram, 

Sorry to say,  but it's not a good strategy for appear in exams.

You can concentrate all three subjects similarly, and obtain a good rank, 

The candidates belonging to all categories for admission to the to the Bachelor of Homeopathic Medicine and Surgery Degree Course should have passed at the qualifying examination (Academic Stream) after a period of 12 years of study with the following subjects. Physics, Chemistry and Biology (Botany/Zoology).

Hope you understand 

Thanks for asking