this going to be like some distant learning school? Or what do the students apart from just passing the "audio test" tend to get in real life (promotion to the next grade or a scholarship?) Talking about those unable to finance their studies in a real school!
Well you could use that as an innovative approach and incorporate it in your idea in the long-run, (to give scholarships to those who satisfactorily pass all the test or something ).
Just be good with your I dea,
muje lgta hai ki yh jaan karega or jindagi bchane mai maddgar sabit hoga.