I agree with Varislintu that it's possible, but I have to add that it depends a lot on what and where you study. My experience has been quite different from hers. For example, most of my courses have required us to study the course 1 before 2, 2 before 3, 3 before 4, and so on.
But if you're luckier than me and study something where there's more freedom and less theory that you must learn in order, and maybe if there's lots of courses that you can pass by reading a book or two (or dozen) and then going to the exam without any lectures - in that case, I think you're able to study more than the 60 credits students are "supposed" to get within one year.* (Most courses are 2-5 credits, but again, it depends.) I'm still doubtful whether you can really get 120 credits in a year. I've never heard anyone getting more than 80-90, but I wish you luck and suggest you go to see the curriculums of the subject(s) you'd like to study. There should be a description of each course and what you are supposed to do in order to pass, so you could maybe estimate how much time you'll need for them.
*if you want to get BA in 3 or MA in 2 years, BA being 180 and MA 120 credits. I don't remember what was the mininum of credits you must get in a year, if there even was any.