Hello Dear,
First take your marksheet to the kendriya vidyalaya school and then they will provide you a form .Fill the form to choose your stream, in few days there will be merit list round will be put on your school announcement board in three rounds the list will decide your seat . Then fill the admission form accordingly.
This is the traditional method how kendriya vidyalaya used to admit their 11th students , now as the current situation , wait for the kendriya vidyalaya to announce what they will refer , online or same old method. Hope this is insightful.
Congratulations for clearing 10th .
All the best for the future .