What differences can you expect if you achieve a 2.1/2.2 and not a 1st?

Hey guys, from my most recent TMA’s I’m on track for a high 2.1 but that could obviously change and lower or increase depending on future results. How much is riding on me achieving the best grade possible? In terms of future study or potential job prospects, how much would a 1st make a difference in comparison to a 2.1 or 2.2? Hope that makes sense and any help is appreciated