Actually, I purposely chose commerce stream since the subjects in commerce like economics, maths are much more related to quant finance.. My idea was to join a local reputed university for Bmath and then give the ISI entrance exam the next year and continue the Bmath program in ISI starting from second year.. But, I am not sure whether ISI will accept me from second year even after clearing their exam...
Also, If I am wrong in choosing my stream then how do people really get into quant finance. As far as I noticed, it is mainly through Bmath, Mmath, PhD in maths and financial engineering which I am eligible to pursue, right?