There may not a jobs after 12th based on PCB group.

You can attempt SSC CHSL after  and you can join defence as Nursing Assistant with your PCB group.

Actually there are many career after 12th(PCB) that students ignore.

You can see here:

• Veterinarian
• Psychologist
• Psychiatrist
• Physiotherapist
• Forensic Scientist
• Pharmacist
• Homeopath
• Nurse
• Podiatrist
• Dentist
• Dermatologist
• Medical Technologist
• Molecular Biology
• Horticulturist

You can go through this.