At Maria's Day School, Howrah at Howrah Maidan, the Accredited Centre of NIOS, formerly National Open School (NOS) is run for both Hindi and English medium for Secondary (10h std.) and Higher Secondary (12th Std. ) with Science, Arts and Commerce streams.

Freedom to learn - With a motto to "reach out and reach all", NIOS follows the principle of freedom to learn is what to learn, when to learn, how to learn and when to appear in the examination. There is no restriction of time, place and place of learning.

Flexibility - Choice of subjects - a student can choose subjects from given list keeping view of the passing criteria.

Admission - A student can take admission online under various streams directly or through study centre.

Examination - Public examination is held twice a year. Nine examinations are offered in five years. A student can take any examination during this period when he or she is well prepared and may avail the facility of credit accumulation also.

On demand examination - A student can also appear on - demand examination (ODES) of NIOS at secondary and senior secondary levels at the head quarter at NOIDA and all regional centers as and when he / she is ready for the examination after first public examination.

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