Looking for some Advice- Chances of getting a vacation scheme with low a level grades

So I didn't get the grades I had wanted for a levels, however being quite unsure as to what career path I wanted to take, instead of taking a gap year and retaking my exams, I accepted my insurance option to a non Russel group university and went along the 'normal, expected' route in fear of being left behind etc.
At first I thought I had made the right decision because I was at least attending any university and somewhat on track. However, considering I am studying law, after having done research and being rejected from internships etc I have been made to reflect more on my a level grades and been made to think this is the reason as to why I can't secure any type of work experience etc. I also acknowledge the fact that a career in law requires a strong academic background, hence my strong focus on my past grades.
I would like to get some advice on whether I should, as a student going into their second year of uni:
(a) stay at university, boost my CV by improving uni grades, work experience, extracurriculars and hope to get a vacation scheme that way
(b) leave university and retake my failed a level subjects, then do an apprenticeship.
Coming from a non Russell group university makes me feel more worried about this so if anyone is reading this after having attended one I would appreciate any advice or guidance you have on this
In any case, please let me know if my worries about a levels are trivial in the long term, thank you!