At this late stage, it's highly unlikely that you'd be able to put together a successful proposal, and demonstrate your ability to execute on it. We encourage students to spend some time contributing before proposal stage, to give us a better idea of the ability to complete their tasks. Further, students are expected to research and draft their proposals with little help. We're able to provide guidance on specific questions, but we won't help you to write your proposal. Research is a big component of GSOC.