I'm fast becoming a die-hard Insa fan, but even I have to say for Sanchi to marry Indu now under these conditions is just plain wrong.
No one should ever be forced into marriage full stop. And Indu is forcing this marriage on Sanchi by threatening harm to those close to her.
Indu really needs to back off, he should prove first his innocence in the poster scandal, and then prove his love for Sanchi, by giving her the space she so desperately wants and needs.
He can help her by sorting out his guruji, and by actually being a student leader and taking care of student needs. Plus he doesn't have to but he can continue learning English also. Towards the end of her education, if he has waited for Sanchi, not hounded her, educated himself further, proved that he now cares about the well-being of others, stopped using physical force to gain what he wants, he should have gained Sanchi's respect.
Hell at that point Sanchi would be the biggest fool ever, if she turns him down, as Indu, is attractive, loves her madly, waited for her, changed his ways for her, and is allowing her to pursue a career to further her name. What more would she want from a guy?!