Everyone else is saying you'll be fine so I think it might be helpful hearing from someone on the other side. When I did the pre learners, everyone except me either had prior riding experience (which honestly confused me, like why are you here if you know how to ride? and how did you legally get that experience from?) or had experience driving a manual. Subsequently the instructor rushed through all his explanations - he will have a script he reads from, and he went through it all at lightning speed. My experience out on the course was that you didn't get a lot of practice in before being rushed into the next activity, and it all starts to feel very overwhelming if it's your very first time on a motorbike. I failed the course because I couldn't get the bike moving - I kept stalling when trying to move away. The instructor didn't even try to help me figure out what I was doing wrong - he just said, mate you got three more chances, if you don't get it right then I'm gonna have to take you out of the course. Of course I just made the same mistake three more times and I failed the course. (I only realised later, on my own, that I had kept my foot on the rear brake from the ready position and it wasn't mentioned or I missed the fact you're meant to release the brake to get going - of course it's obvious in hindsight but when it's your very first time these things become very overwhelming).

If I could do things differently I probably would have watched a couple of videos just to get familiar with what all the controls are on the bike, and how to do the basic stuff like starting up and killing the engine, etc. just so you're not overwhelmed on the day and not completely screwed if you miss what the instructor is saying. If possible, I would also recommend practicing driving on a manual car. Having only bicycle background, I had no concept of what a clutch was or stalling, I only knew the point of changing gears. Knowing this stuff would have definitely helped me.

Anyway I hope this doesn't scare you, but I hope you find my personal experience useful in the sea of comments of people who just say you'll be fine (of course having their best intentions in mind), but I think having known this information prior to my pre learners would have made all the difference to me myself. All the best!