I'm in a similar position, I got around 62% in my second year but my second year is weighted slightly more than yours. Mathematically, it's definitely possible but I think it's important to remember that you don't need a first, and a 2:1 is still a really good grade. Also with a placement, if you're planning on going back into that same industry, the experience you've got over that year will definitely help a lot with graduate jobs.
So it's possible, but definitely not the end of the world if you don't get a first and it's not worth stressing yourself out an unhealthy amount over.