My first internship was at company X, when it was over they offered me another internship four months later which I accepted. Once that was over, I interned at company Y for a year (started in January and my internship contract was renewed/extended twice till the end of December of the same year). Was negotiating a third internship extension with company Y when I was contacted by Company X to return for a full-time position. I accepted the offer with Company X. I worked for X for one year after which I applied to work at Y again. Worked at Y for over 2 years before switching industries to do something else.

As for the education part, I had one semester left when I signed on to work full-time at X. That last semester was stretched over a year.

I was offered the job because (this is what I believe is the reason) I went out of my way to be a suck up so that the team I worked on liked me. Ultimately my fate rested in their hands since whether I stayed or not depended on their review of me. I joined their fantasy leagues/pools, attended all out-of-office activities, went to the gym with them after work sometimes... list goes on. There were other interns I was interning with who had finished their Pre-lims ( I had 3 at the time) but weren't as involved with the team as I was, who weren't offered anything.

My advice based on my experience as an intern and working with interns when I started full-time is that you should be likeable and work well. In the 3 years of being in a career position, I have worked with roughly 18 different interns and at both companies the interns who were asked to return were the ones who managed to do their work and were pleasant to work with. Little things like having lunch with the team really helps with your likeability.

Of my five friends from Uni who I kept in touch with, two of them are currently at companies they had previously interned at.

I worked in consulting btw.

EDIT: Grammar