Do you have a cert from another ski association such as BSA1 or Euro equivalent?
I've been prepping for PSIA L1 & your Q prompted me to wonder if CSIA published similar webinars and such.
Googling "CSIA L1 assessment" And "CSIA L1 webinar" generated a lot of hits.
Such as
Maybe Jilly or someone else in CSIA can point to other examples or suggest which ones might be useful?
They want you to pass.
But you have to be certain to understand what technical skiing fundamentals are expected to be second nature to you, and how they are expected to be applied in a lesson plan (5 in PSIA. Per my most recent webinar, rather than list them, i have to be prepared to explain how i use at least 3 of them in any exercise or drill i prepare for a student). Plus a range of social and teaching skills like greeting the guest, developing an understanding of their needs, how to (shorthand) "coach" or inspire besides the technical skills. Since a lot of us lower cert teachers often spend half of our time with small, young, guests, there might (or might not) be a section on typical activities for very young beginners. In PSIA i have to be able to develop a lesson plan and use it, for any age guest or group they decide to throw out. Funny, in real life that has never been a problem - i love the process. Somehow trying to conceptualize it for a test is making me anxious.
I think what i am trying to say, is be sure to understand & practice the parts that are teaching focused. If anything like PSIA, they don't care if you memorized the manual, they want to see how you apply it; and whether you can describe what you are doing and why, while doing it. We can all ski pretty well (presumably well enough for L1) or we would not have been nominated to take the cert. PSIA (appropriately) makes clear that during an assessment, they are constantly grading your personal, interpersonal, and group interactions.
Good luck!