2 answers
Mickael’s Answer
Probably attend a school for a computer science degree (like bachelor, master, PhD) according to your aspirations.
Depending on your first job goal, there might be interesting topics to take in addition to just maths, physics or some specializations depending on your interests.
While also attending college / university, try also to find internships in the topics you are interested. Internships help you feel what it looks like to work in companies which will help you find the type of domain you want your first job be. Be aware of when to apply to internship. Here is the Dell Technologies webpage if you are interested.
https://jobs.dell.com/students
Fuzzy’s Answer
After completing your 12th with PCMC, you have several options to go with in future depending on your preference and interest like pursuing Engineering in any stream, Architectural courses, Economics and Statistics, Geological Science etc.
It is important to be clear in your interests and career aspirations as these are the important deciding factors for one's career and without knowing these it would be difficult for us to provide any details.
Kindly revert for any further queries, also if you liked this answer then rate it 'Best answer' or give a 'Thumbs Up' rating.
All the Best!