Non - Traditional Lateral - Freaking out over modelling

So context, I’m a completely non-traditional candidate, I have 4 years in a tech role. I started my journey to break into IB as an Analyst 1 about a year ago. After a ton of networking and studying, I’ve been lucky enough to have 2 opportunities come up at 2 different banks.

I feel really confident about my technical and behavioural skills to hold my own in first round but I’m extremely stressed as there will be a modelling test with both LBO and DCF. I’ve fully completed training the street LBO course but I genuinely can’t complete any of the standard practice tests out there. I feel like the TTS templates and methodology are way too specific and overly detailed. I get very confused when the debt details are outside of what’s covered in TTS. I’ve been watching YouTube videos but everyone has different methods of tackling these problems. Honestly, I’m stressed that I’ll throw all this hard work and opportunities out the window if I don’t get this right. Any sort of help or advice would be greatly appreciated!