If you are interested in Medical then go for Science with Biology and if you want to do Engineering or any other technical Course then go for Science with Mathematics. If you want to do professional courses like CA, CS and have interest in finance and accounts then go for Commerce.

Commerce:
Commerce is a study of trade and business that encompass each and every process and activity that takes place in any commercial organization at any level.

Career Options available in Commerce Field:
Entrepreneurship
Chartered Accountancy
Forensic Accounting
Cost and Work Accountancy
Company Secretary ship
Investment Banking
Banking
Marketing
Market Research
Capital Marketing
Business Administration
Administration
Human Resource Management
Management
Insurance
Law
Media/Mass Communication
Financial Analysis

SCIENCE:
Science allows students under this stream innumerable career options. Science involves the systematic study and investigation of all natural phenomena and occurrences by employing various methods such as observation, experimentation, etc.

Medical Science:
Anatomy
Biochemistry
Bioinformatics
Biomechanics
Biostatistics
Biophysics
Cytology
Dental Science
Embryology
Epidemiology
Genetics
Hiostology
Immunology
Medical Physics
Microbiology
Molecular Biology
Neuroscience
Nutrition Science
Pathology
Pharmacology
Photobiology
Physiology
Radiobiology
Toxicology

Engineering:
Aerospace Engineering
Chemical Engineering
Civil Engineering
Computer Engineering
Electrical Engineering
Engineering Management
Industrial Engineering
Integrated Engineering
Materials Engineering
Mechanical Engineering
Military Engineering
Nuclear Engineering

Others:
Chemistry
Ethnobotany
Environmental Law
Patent Law
Technical Writing
Pharmaceuticals
Oceanography
Software Design
Space Exploration
Government Policy
Forensic Science
Biotechnology
Metallurgy
Ceramics Industry
Plastics Industry
Paper Industry
Medicine
Teaching
Engineering
Geochemistry
Agrochemistry
Military Systems
Agriculture
Aqua Science
Astronomy
Environmental Science
Forensic Science
Food Technology
Geology
Geochemistry
Meteorology
Plant Pathology
Photonics
Seismology
Paleontology