Global alternative asset manager Blackstone has acquired a 37.5 percent stake in India-based medical test preparation provider Aakash Educational Services Limited (AESL) in a transaction that reportedly values the company at USD500 million. AESL offers preparation services across 200 centers and 130 cities in India, reaching more than 250,000 medical students. Blackstone will partner with AESL to grow the company’s digital education platform. Financial details of the transaction were not disclosed.