Dear Ashutosh,
Thank you for submitting your proposal to GSoC this year. We have many excellent proposals submitted this year, but we were only given very limited slots by Google. While we cannot provide specific feedback regarding our selection process, I will say that in general people submitting proposals should pay close attention to the capabilities that are already in SageMath and other libraries, write a proposal that matches the problem that the project wishes to address, try to make it clear in your proposal that you are prepared to start coding when GSoC begins, and you have thought about how your code will fit within the current SageMath codebase.
Best,
Travis