New Delhi-based Aakash Educational Services Limited (AESL) is the biggest education organisation in India. : Edtech decacorn Byju’s is in talks to acquire exam preparation firm Aakash Educational Services Limited for about $700 million-$750 million, according to the sources. “But the conversations are very early. Even the term sheet has not been signed yet,” said an industry source with direct knowledge about the matter. New Delhi-based Aakash Educational Services Limited (AESL) is the biggest education organisation in India. It provides comprehensive test preparatory services for students preparing for medical and engineering entrance examinations.