Hey divpriya,
The admission process of class 11 will be follow your school ,they will inform you and talking about classes most of the school start 11vnth standard class in july ,but it varies school to school ,many school start their session right after your 10nth exams .
So you need to enquiry your school regarding this.
Hope it helped you!

Hello,
Admission to class XI are conducted by respective schools themselves. It is usually conducted in the month of February-March of that year.
For specific details and dates go to the official website of the school you are seeking admission in.
Usually the forms for class XI are offline and you need to go in person to get admission.
Classes start in April first week.
However this year, due to the ongoing corona pandemic the schedule would be delayed.

Good luck