So, do you want to be a teacher because of the money, holidays or the appeal of simply being a teacher (I am the latter, have wanted to be a teacher for some 3 years now and not for the wage but because I genuinely like teaching).
So, basically, there is a chance (however good we don't know) of you getting a well paid job without your degree or you can get your degree and have something to lean back on, with or without a job.
Either way, it's up to you but I would say this other job is a bit of a gamble because it could heavily affect your grade next year, however, only you know what you're capable of.
The teaching job, is it in a Primary school or do you want to do a PGCE after your degree?
I am about to start my second year too, except mine is in Biomedicine.