Vorker runs the admin around your scheduled courses: confirmations, pre-work, certificates, company invoices and alumni announcements. You approve everything.

Only under a standing rule you set up and approved: for example, every confirmed booking gets the confirmation and the pre-work pack. Anything outside your rules, and anything new like an announcement, is drafted and waits for your press.
Yes. It matches participants to the company that booked them, raises one invoice per company for their seats, and books each against the cohort. You approve each invoice before it goes.
That is exactly the size it is built for. Twelve cohorts a year is several hundred confirmations, certificates and invoices, and there is no course administrator to hand them to. Vorker is that administrator.
You tell it, in one line: everyone completed except the two names you give it. It sends certificates to the completers and drafts a friendly next-dates note to the ones who missed the day.
Photograph the venue invoice or the catering receipt and it is booked with the tax split out and the image attached, filed against the cohort. You can ask what any course actually cost to run.
No. You type or say what you need, the way you would tell a course administrator, and Vorker works inside the tools you already have: your email, your calendar, your sheets, your accounting.