I liked the video, well beyond my skill level there. I would have likely gone with stick men on a PowerPoint slide.
For the exam: you gotta do practice questions. And I mean thousands of them. Whenever I would finish a reading I would do hours of practice questions, and when I’ve moved on to a new topic I would still do practice questions on the previous readings in my downtime to keep it fresh. The last month and a half has to be mock exams non stop.
150 hours is definitely not enough. I started in January and didn’t keep track of my hours but I have to believe it was north of 300. Probably much higher.
This is your year brother. And if it doesn’t work out, stick with the graphic design cheers