Hi Ashraf,
There are many schools who provide admission in class 11th science both private as well as government. Some take admissions through entrances and some on merit based only.
For taking admission on merit based , you have good score in physics , chemistry and maths for PCM . For PCMB you also have a good score in boilogy too.
For entrance based, you have to crack the exam or interview.
As the 10th results are not released so, you have to wait for it but you can start applying and finding schools of your choice with science stream.
Once the results will be released, you should fill the admission form or write the application with the documents attached/needed. Submit it on the office during the summer break. If you are shortlisted , you will receive a call from the organization.
It vary with school to school , as they have different criteria and procedure over all.
Hope, I answered your query.
Best wishes!
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