Prism VR, a startup that teaches math with VR, raised $12.5M in a Series A funding round.  The company will use the capital for product development and marketing. Prism VR's product focuses on bringing problem-driven, tactile, and visual learning to math teaching. The company already works with more than 100 schools across 26 states. Anurupa Ganguly founded Prism to increase low math proficiency rates across the U.S. He previously was a math and physics teacher in Boston.