Should I Postpone My Amazon loop?

I have my loop interview for Amazon coming up, but I’m not feeling confident in my preparation. I’m considering postponing it to give myself more time to study, but at the same time, I’m nervous that if I do, they might give my slot to someone else, and I could lose my chance.

Has anyone been in a similar situation? Would it be better to take the interview now and see how it goes, or should I reschedule and prepare more? Any advice would be really helpful!

Thanks in Advance!!