An interesting presentation. I am not looking to invest in this kind of venture at this time, however, so I will only offer some feedback on your presentation.
It seems like your venture is already on its way to being successful. Expanding into new markets, like English and science is smart. Leverage the success you have had with your math offering and you should find a ready market. That BCLN already offers your product seems like a benefit, even though you list them as a competitor. Perhaps there is a greater opportunity for synergy with them in the future. Good luck!