Mumbai-based ed-tech startup Shirsa Labs Pvt. Ltd has raised $500,000 (Rs 3.21 crore) in a pre-series A round, a person in the know said. The amount comes from multiple existing investors in a round led by Cross Border Angels (CBA), which is an investment network started by US-based consultancy Scaale Group. The angel investors that participated in the round include ah! Ventures; Dewang Neralla, chief executive of payment service provider Atom Technologies Ltd; Mahesh Kothurkar, founder of consultancy Global Footprint Advisory.