Abl Schools, a nearly two-year-old, San Francisco-based company that makes time and resource management software for middle schools and high schools, has raised $7.5 million in Series A funding. Rethink Education led the round, with participation from Sinovation Ventures and earlier backers Owl Ventures, Reach Capital and First Round Capital. The company, which had raised $4.5 million last year, has now garnered $12 million in funding altogether.

Abl was founded by CEO Adam Pisoni, himself a high school dropout who formerly co-founded and served as CTO of the enterprise messaging company Yammer. (Microsoft bought the company for $1.2 billion in 2012.)

Pisoni had stayed on at Microsoft as a corporate VP for a couple of years, but even then, he’d begun thinking of how to improve on…