Well, when you need to fit everything into the suitcase the best choice is to economize. Clothes are important, only shoes that you actually need are crucial, and stuff you can wear with many combinations and layers so as to serve both in summer and in winter is useful as well. Also! Stuff that can be machine washed only, save for the one or two dress things (if possible).
I've gotten it down to where I have a medium sized duffel for clothes and a smaller one for books, supplies, etc. The only electronics I'm bringing are my laptop and my (UK) mobile from 2 years back (hope it still works!). Make a packing list and then ruthlessly downsize it. It can be tough to part with things due to space, but in the end it can be done.
And yes, laptops will work. You just need to be sure to get the plug converter.