PhysicsWallah, the edtech unicorn, is in talks to acquire Drishti IAS for Rs 2,500-3,000 crore.The acquisition would be one of the largest in India's edtech sector.PhysicsWallah aims to raise $500 million in an upcoming IPO at a $5 billion valuation.The acquisition would diversify PhysicsWallah's offerings and enhance its offline presence.