Hi there,
First of all, apologies for the apparent mis-understanding. In the GMAT Orientation video on your syllabus, and certainly at the first session, there would be explanations as to how the course works, the Ultimate Practice Test, and the Diagnostic test.
We do have you register for the UPT early so as to get the date/time you desire at Pearson, but we usually recommend taking it towards the end of your studies (and it's listed at the end of the syllabus with a reminder to take it).
We give all students a Diagnostic Test on the first day of class that serves as that baseline score. Then throughout the course, you have 8 CATs to take online, plus the UPT, to serve as practice and to gauge your progress.
The good news is, since you haven't started your prep at all, you shouldn't worry too much about that first score (that was why I had been surprised/confused, as most people take UPT at the end). Certainly you can use your Smart Reports on your syllabus to analyze how you did on the UPT and identify your strengths and weaknesses, and if there are areas such as basic math content you need to review that you want to start now, before 1/31, that will only help you. Otherwise, plan to follow your assignments before/after each class session as laid out on the syllabus once your course begins. You'll still have the 8 CATs (plus 2 GMAT Prep CATs) to take throughout the course and towards the end of your studies, but now that you did the UPT at least you know what to expect at the testing center, so all should be fine.
Good luck with your course and let me know if you have other questions!
Jen Kedrowski
Kaplan Test Prep & Admissions
GMAT Teacher
MBA Admissions Consultant
National Product Team Member