Net profit for April-June quarter nearly doubled for Billionbrains Garage Ventures, which operates wealthtech platform Groww, with a 94% year-on-year increase to Rs 735 crore riding on higher contribution from margin trading and commodity derivatives.Revenue from operations rose to Rs 1,501 crore from Rs 904 crore a year earlier. Sequentially, however, total income was largely flat, down 0.3%, while profit increased 6% from the March quarter,