Echoing those who have said you can, it's true. I was on 66 last year (albeit a mid/high 2.i) and have now got an overall 1st - you just need to make sure you get 1sts in nearly all of your work in your 3rd year (you can afford to get maybe one high 2.i but otherwise be consistent).
It is possible, you just have to work hard to achieve it.