F1 Visa rejected twice

[riis]

Hi,

I have rejected visa twice at Delhi.done MCA in India.

1st interview: why applied to only 1 university. Dec-11

Then Applied at 4 Universities and got 1 admit. April -12

2nd interview: why MS again in computers when u have master already. you will not come back.

Please tell me what shall i do for third interview.

Thanks
Riis