I did A level economics and then had some economics modules in my degree - the modules were far easier and far less in depth than the A level. After a couple of lectures, I realised the standard was far lower and only attended the occasional one just to keep attendance records looking good. I didn't even do any revision and still got pretty high marks in the essays and exams.
Same with Maths A level. My degree had a couple of modules of "quantitative analysis", basically probs, stats, and averages, standard deviation, critical path analysis, upper/lower quartiles etc. It was a doddle, I'd say GCSE standard rather than A level.
The area I struggled with was law modules - but some of the others doing the degree had done A level law and they said the A level was far higher standard and could give me lots of help, and they basically sleep-walked through the law modules.
I came away thinking, certainly in the first 2 years, that the standard wasn't particularly high, and no higher than A level. It was year 3 when things ramped up. But of course, you need years 1 and 2 to do the lower level work, particularly if you've not done A levels in the relevant modules.
After all, there are usually loads of "optional" modules from different disciplines you can take in years 1 and 2 that have no relevance to your chosen degree subject, such as a foreign language for beginners etc., so the standard of years 1 and 2 is going to be pretty low.