Hello Aspirant
The best way to compare two Boards of Examinations is to see if it is UGC-recognised because that puts all the boards on the same pedestal. After researching on the Internet, it is safe to conclude that BOSSE, Sikkim is UGC-recognised and all its certificates are valid all over India. The National Institute of Open Schooling (NIOS), Govt. of India has itself recognized BOSSE was a valid and authentic Board of Examination.
So, because BOSSE, Sikkim is UGC-recognized, it is surely equivalent to CHSE Board of Odissa.
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