Hey there, I'm a ULaw undergrad at the moment who shared very similar fears when I joined, especially knowing that my friends were at Russell Groups getting grad jobs. I got the same A levels as you and also had to join due to personal circumstances, which negatively impacted my mental health. It was demoralising to think that I was on the backfoot, especially since I didn't know where to start. I also think the standard of teaching at ULaw is underrated, with lots of practical knowledge being tailored into the course which I actually enjoy. Could definitely have more career events and such, but overall a good uni.
I spent the last year really committing to firm events, mentoring schemes and just developing myself as a candidate (little bit every day goes a long way). As a result, I've managed to get 3 vacation schemes this year (one of which is silver circle) and have got a TC interview next week, which I genuinely did not think was possible at all at the start of the year. At my assessment centres, I was the only person who wasn't from a Russell Group and often one of the only non-white people, but you just have to trust in your abilities as a candidate and know that you have a lot to offer! Firms are becoming increasingly aware of recruiting diverse talent, which means casting the net wider to universities for talent that they might not previously have considered. Being a top class student at ULaw means you're a top class candidate in with a strong work ethic and commitment to the law, so please don't feel discouraged as studying law is hard everywhere!
My advice, which my personal tutor gave me at the start of this year, is to do everything that you possibly can to be a better candidate. Being more commercially aware, knowing which practice areas you like and what challenges they face and how the role of a lawyer is changing are examples of things you can do. Connecting with people on LinkedIn and meeting for coffees with lawyers who are happy to help. Being disciplined and doing little bits every day will accumulate into huge change from where you started, provided you give it your best shot. If you don't leave a stone unturned, chances are you'll be exactly what a law firm will be looking for. Glass ceilings are made of glass for a reason, because they are made to be broken.
Hope this helps, keep faith x