Hey Chandana, 

There are several career options you can pursue after 12th grade with Science (PCB) Subjects, I am here mentioning them:

• MBBS
• BAMS (Ayurvedic)
• BHMS (Homoeopathy)
• BUMS (Unani)
• BDS (Dental) 
• Bachelor of Veterinary Science & Animal Husbandry (B.VSc AH)
• Bachelor of Naturopathy & Yogic Science (BNYS)
• Bachelor of Physiotherapy (BPT) 
• B.Sc. Nursing
• B.Sc. Dairy Technology
• B.Sc. Home Science
• Bachelor of Pharmacy
• Biotechnology
• BOT ( Occupational Therapy )
• BMLT (Medical Lab Technology)
• Paramedical Courses
• B.Sc. Degree (There are several fields in BSc degree a PCB student can pursue and has a good scope too) 
• LLB (Bachelor of Law) (Integrated with BA, B.COM, BBA, Etc.) 
• Travel & Tourism Courses
• Environmental Science
• Fashion Technology
• Hotel Management
• Designing Courses
• Media/ Journalism Courses
• CA /CS Program

Good Luck!