Really and truly it is beneficial to stay and complete the third year if it's only a few months. It will look better on the CV and people will question your commitment if they se on your CV that you dropped out.
You still have to pay for the last 2 years and most likely the third year now it's Jan. If you're okay with that and still want to drop out then so be it.
I stopped during my second year and now I'm taking a break and working towards being a train driver. I had no friends at the time, my course seemed like a waste of time and I wasn't enjoying it life.
I don't regret it, I'm enjoying it more now, Uni wasn't that great an experience.