S. 12AA : Procedure for registration–Trust or institution-Cancellation of registration cannot be done retrospective effect- Education- Amounts spent on construction of buildings and acquisition of Television channel for educational purposes-Entitle to exemption-Depreciation is allowable–Proviso inserted w.e.f. 1-4 .2015 is not retrospective–High Court has the power to set aside the order of Settlement Commission which i.e. erroneous. [S. 11, 12AA(3), 245D(4), Art. 226.]