c'link are not able to approve volunteer work - needs to be negotiationed with your job services provider. as long as your activity comes up to 15 hours per week, you'll be ok.

if you have 14 contact hours of study and you can get confirmation that you are expected to study more than an hour at home, it will get you to your 15 hours

from Dec to Mar, you would just have to suck it up and look for work - you never know, you might find an employer that you actually enjoy working for if you put yourself out there - and then you could continue working PT or casual as well as studying - extra money and all that jazz...