Kendriya Vidyalaya CCI Bokajan offers classes from I to X, as it is a secondary school affiliated with the Central Board of Secondary Education (CBSE). The school provides education up to class 10th, but it does not seem to offer classes 11th and 12th based on their website.

If you're looking for schools with higher secondary education (classes 11th and 12th), you might want to explore other options or nearby Kendriya Vidyalayas that offer senior secondary education. To confirm the availability of classes 11th and 12th, I recommend contacting Kendriya Vidyalaya CCI Bokajan directly or checking their official website.