To determine if you're eligible to write KCET in Karnataka, let's break down the eligibility criteria:

Eligibility Criteria for KCET

1. Citizenship: You must be an Indian citizen.

2. Education: You must have passed or be appearing in Class 12 or equivalent examination from a recognized board.

3. Subjects: You must have studied Physics, Chemistry, and Mathematics (PCM) or Physics, Chemistry, and Biology (PCB) in Class 12.

NIOS Board Eligibility

NIOS (National Institute of Open Schooling) is a recognized board by the Government of India. Since you're studying in NIOS through Sunbeam Noida school, your board is valid.

Karnataka Residency Requirement

As per the KCET eligibility criteria, there's no specific requirement for Karnataka residency for writing the exam. However, to be eligible for government seats, you may need to fulfill the Karnataka domicile requirements.

In conclusion, since you're studying in a recognized board (NIOS) and fulfill the basic eligibility criteria, *you can write KCET in Karnataka*. However, to confirm your eligibility for government seats or other specific quotas, I recommend verifying the detailed eligibility criteria on the official KEA (Karnataka Examinations Authority) website.