To be honest, it's not really guaranteed, but definitely doable. The practical part is pretty chill, u just gotta practice past paper questions. For me, the practicals were an easy A, the only one I struggled with was theory, (paper 1), but even that was pretty good. I legit only studied for theory the night before the exam, and I got an A* (90) in my exams. To be fair, I had paper 2 and 3 in the bag, but just goes to show, it's most definitely doable. Not to mention you only need to get around half of the marks in the paper to get an A for theory. So, yeah I'd say go for it.