S. 143(3) : Assessment-Search-Income from undisclosed sources-Jewellery discovered in search-Assessing Officer cannot make separate addition over and above excess identified in search-Rate of tax-Penalties-Levy of tax under section 115BBE not in accordance with law. [S. 5, 69, 115BBE, 132, 132(4), 271AABB, 271AAC]