S. 11 : Property held for charitable purposes-Educational activities-Not registered under section 12A-Computation has to be done under normal provision of the Act-Corpus donation of Trust-Addition cannot be made while computing as per normal provisions of the Act-Anonymous donations-Only applicable to trusts which are registered under section 12A, and does not deal with unregistered charitable trusts-Donations cannot be added as cash credits. [S. 12A 68, 115BBC , 158BC]