S. 10 (23C): Educational institution-Wrong sub section is mentioned in the return-Mistake of counsel-Exemption is allowed-Non foling of audit report-Not applicable to university-Entitle to eexxemption-Delay of 691 aand 706 days-Mistake of counsel-Delay is condoned. [S. 10(23C)(iiiab), 12A, 44AB,253(5), 254(1)