Process was 1st round of Hackerrank test followed by an interview for selected candidates. I would suggest you don't waste time for preparation. I wasted my 3 days to work hard even though I had my end semester college exams, but they asked all non technical questions like case studies. Then I answered each and every question. I was waiting in hope that I will get offer. But Swiggy HRs don't even communicate with you and delay the results. I don't know what criteria they use my fellow candidates (5-7) I know they also got rejection.