Please advise for Jane Street final round w/ no interview experience

I'll preface this by saying I feel incredibly fortunate to be in this position, but I have a final round interview in person for Jane Street next week and am pretty terrified. I'm first gen/low income

I'll preface this by saying I feel incredibly fortunate to be in this position, but I have a final round interview in person for Jane Street next week and am pretty terrified. I'm first gen/low income, so this is a life-changing opportunity not just for me but for my family as well and I feel obligated to throw everything I have at it. Essentially how I got here is that previously I've been fortunate enough to be part of a first generation college program at a FAANG company that provided an internship the past two summers, and I saw the trading salaries and figured I had to give it a shot. I've done some Leetcode on and off for the first time over the past month, and my first ever live coding interview was Jane Street's first round last week, which I luckily managed to pass. I saw online about the overall structure of the full-day interview with multiple rounds before/after lunch, and honestly just feel so scared that such a life-changing opportunity is so close yet I probably will end up blowing it since I have so much less interview experience/knowledge than all of the insanely talented people applying. So, I decided why not make a Reddit account and ask people who might actually know something because literally anything would help. Might be shouting into the void, but is the style similar to the first round interview or do they bring in more Leetcode-style questions or systems/other questions outside general coding implementation? Also, to adjust my own and familial expectations, about what percent of people make it through final round? Literally any other info also helps, happy to also answer questions if this does get any answers! Thanks so much!