Hello! To start, I highly recommend that you invest in a prep course (even if it's not with Barbri). It will help you to focus especially if you're working full time, as there is quite a lot to prepare and study before you attempt your actual exams.
I did both SQE1 and SQE2 prep courses with Barbri. You're correct that Barbri adopts the "space repetition model", and this is particularly true when it comes to prepping you for the SQE 1 exam which is on an MCQ basis. Barbri will prepare the materials based on the SQE exam specifications, and the prep course for SQE 1 will adopt video lectures, questions, and then reading, before repeating the same process. This is the "space repetition model". Now, their MCQ questions and their materials are drafted in simple English, in comparison to other SQE providers. But, in actual exams, the questions are drafted slightly long, yet you can answer those questions as the prep course is to prepare you to understand the law, and apply the law. Most importantly, they assigned a learning coach to you for SQE 1, and the relationship you build with your learning coach will help you to navigate this SQE route, which often can be stressful especially if you're juggling multiple things!
For SQE 2, it is going to be very different. Whilst to the extent, Barbri adopt some "space repetition model", but SQE 2 is just a different approach. This is because SQE2 consists of various practical exercises designed by Barbri that you need to do and submit for review/feedback. So, time management is key in ensuring you get into the mode of practice, and practice. Also, unlike SQE 1, where the Barbri system will by default set you an hour to study. The Barbri SQE 2 prep course does require you to be self-disciplined and committed to completing the exercise, and it's not different to some of other providers (not all - just to caveat!).