Given the task definition and input, reply with output. Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.

Passage: In India, private schools are called independent schools, but since some private schools receive financial aid from the government, it can be an aided or an unaided school. So, in a strict sense, a private school is an unaided independent school. For the purpose of this definition, only receipt of financial aid is considered, not land purchased from the government at a subsidized rate. It is within the power of both the union government and the state governments to govern schools since Education appears in the Concurrent list of legislative subjects in the constitution. The practice has been for the union government to provide the broad policy directions while the states create their own rules and regulations for the administration of the sector. Among other things, this has also resulted in 30 different Examination Boards or academic authorities that conduct examinations for school leaving certificates. Prominent Examination Boards that are present in multiple states are the CBSE and the CISCE, NENBSE Question: How many Examination Boards exist in India?
30