Hello Mr. Anonymous. After 10th standard, you can opt for Science stream and Commerce stream. In science stream you have various options - pure science group, computer science group, bio-math group are standard streams offered in most of the schools. Certain schools offer exceptional subjects. Leaving the exceptions and coming back to your question - you want to take Physics, Chemistry and Mathematics right? You have two options, either you can take computer science group or biological group, both have p-c-m subjects. Cs group has additional computer science as one of the subject whereas bio group has  biology as additional subject. Finally, whatever group you take in CBSE, English is mandatory [ MAIN SUBJECT ] as the fifth subject. I would suggest  you ask your school faculties and seniors about this, they will be in a better position to help you. Hope I have answered your question.