S. 144: Best judgement assessment-Search-Incriminating material-Assessment is valid-Best judgement-Failure to issue show cause notice for best judgement assessment-Assessment not valid-Jurisdiction-Order of transfer of jurisdiction challenged before High Court-Stay not granted-Completion of assessment in pendency of proceedings before High Court valid-Statements recorded by Investigation Wing used to support additions made-Failure to give an opportunity to cross-examine witnesses-Addition is not valid-Unsecured loan-Addition is not valid. [S. 68, 139, 144, 153A, 245C]