It is possible, however, rather than worrying about the percentages you need, you should be speaking to your lecturers to find out what you need to do to bring your work up to a 2.1/first standard. What let you down this year? And how did you do in first year? If it was exams, perhaps you need to focus on improving your revision technique, taking better notes throughout the year, and dealing with stress better. If it was coursework, make sure you are following the marking criteria closely, and you answer the question. To get above a 2.2, you generally need to be including your own ideas- do you need to do more additional reading/research.
Also, if you are doing a dissertation this year, the grade you get in that may affect what classification your final degree will have. Some universities/courses have a rule that you cannot get a first without getting a first in your dissertation. Getting a good dissertation mark will bring up your overall results, though, particularly if you do less well in exams.
Given that you took 7 modules last year, I would guess they do not all have equal weighting. How many modules are you taking this year, and how many credits is each module worth?