Hi aspirant
BOSSE, or Board of open schooling Sikkim is a recognized education board by the government of India. So,
Yes, you are eligible for the NEET examination.
The eligibility criteria for the exam, NEET 2023 is as follows

• The candidate must have attained the age of 17 years as on 31st December 2022.
• The candidate must have passed his 10+2 or equivalent with Physics, Chemistry, Biology and English as core subjects from a recognized board which in your case is BOSSE.

Hope this helps
All the best :)

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