Bengaluru-based edtech startup BYJU'S is close to raising $200 million at a valuation of $12 billion in a round that will see participation from BlackRock and T. Rowe Price, media reports said. The round could close as early as November-end. Earlier in September, BYJU'S had raised $500 million led by US-based investor Silver Lake at a valuation of $10.8 billion.