S. 10(23C) : Educational institution-Wholly or substantially financed by Government -Receiving grant from Government in excess of 50 Per Cent. of its total receipts-Entitled to benefit of exemption for assessment years prior to amendment-Original assessment u/s 143(1) – Reassessment is held to be proper. [S.10(23C)(iiiab), 143(1), 147, 148]