What I would suggest is sitting in on a few advanced courses and talk to those lecturers who seem most relateable to you. I found the first years of my studies

What I would suggest is sitting in on a few advanced courses and talk to those lecturers who seem most relateable to you. I found the first years of my studies dreadful. I barely survived the these years, but once I found subjects that I enjoy it stimulated my competitive spirit. It made me realize that I am not a "generalist" and get extremely bored by things that everybody is doing. But as soon as I can see some level of obscurity and the opportunity to "find something new", my motivation gets a massive boost and I can dedicate myself for weeks to some minor details. But this is just me. The big challenge for you is to find out what truly motivates you and then arrange things in a way that play to your strength, i.e. squeeze those examination regulations until you find a school that supports your preferences. Nothing wrong with accepting that you are a bad at exam taker. But if you don't want to change this, you have to compensate for it by putting in the extra effort of finding a school/degree, that allows you to retake tests multiple times and/or replace them with oral disputations/papers, and one that gives strong weight to the final thesis in the total grade calculations.