What you get in your second year doesn't really matter, though. Just focus on a solid 2:1 in the second year and you'll be able to actually graduate with that classification.
At my university, they only have single digit percentages so anything over 0.5% will become 1% and anything below 0.49% would be 0%. Not entirely sure if the same goes for other universities though. Does it matter if you get 2:2 instead of a 2:1 in your second year though?