Manipal Group Chairman Ranjan Pai is planning to invest $250-$300 million in Aakash Institute, the test prep subsidiary of crisis-hit BYJU'S, The Economic Times reported. Pai's initial plan was to invest about $70 million but will now be infusing $170 million in the first stage to clear BYJU'S debt to Davidson Kempner. Pai is also eyeing a larger Aakash stake.