Doubtnut, which helps students learn about math and science concepts using short videos, raises $31M Series B led by James Murdoch's Lupa Systems and SIG Manish Singh / TechCrunch : TechCrunch 2021-02-25 Manish Singh Lupa Systems, TechCrunch, Doubtnut, James Murdoch's, Manish Singh Related Coverage View article DealStreetAsia View article VCCircle Doubtnut raises Rs 224 crore in funding led by SIG, Lupa Systems The Economic Times SIG, James Murdoch's Lupa lead Series B round in Doubtnut TechCircle