Hi! I'm very new to this so sorry if this is a silly question. I applied to an open day and just got a rejection. Whilst applying, I was debating whether or not to talk about my mitigating circumstances/how to word everything. By the end, I decided not to, which I now regret. Obviously I have no idea what would have happened otherwise, and it's entirely possible that I would have been rejected regardless of its inclusion.
For context, I recently graduated with a first in a STEM degree from a RG. I had untreated/undiagnosed ADHD in my first and second year and my academic record reflects that. I also had ECs for half of my exams in my final year due to personal reasons, and ended up with a 2:2 and a 2:1 in the affected units. I had an upward trajectory and got firsts in all my other units in my final year, but got a 2:2 overall in first year, and a 2:1 in second year (with one unit that year being a pass - there were also personal things happening that year which affected my grades but I never spoke to my uni so there's no official EC, which is also why I'm a bit lost on what to do).
How do I go about talking about this in applications, without being overly personal, or am I meant to be very personal? Will talking about it even benefit me, or will it make a firm think I'm unreliable, or is it more unreliable to have this type of transcript with no explanation? As I did a non-law STEM degree, how strict is the expectation some firms have for a candidate to have 2:1s across all units? Do my unit grades make me an instant rejection for certain firms or am I overthinking? Also, the firm that rejected me has multiple open days, can I apply to another one that's still open, but this time including the mitigating circumstances? I really am interested in applying for their VS, but as someone from a non-law background with no law WE, I feel like this is the bare minimum to make me stand even a tiny chance at progressing to any stage at all lol.