I used flashcards a lot (I particularly love the Anki program). A couple of pointers on flashcards....
Starrsgirl's flashcard strategy also works well for me. However, flashcards are
not the best strategy for everyone. Some people hate them. Some people in my class love whiteboards, some do better just reading the powerpoint over and over, and some do best going through the lectures and talking out each slide with a classmate, then quizzing each other. Some people love group study, some hate it. Don't assume one thing is best for you without trying it. Personally I do a bit of all of the above. If you find something that is working for you, don't feel like you need to change it.
My study strategy varies a lot by class too. Some classes you have to memorize word for word 100+ slides each week to do well. Others you can read through 6 weeks of lectures once the night before the midterm and get an A without breaking a sweat. And most classes fall somewhere in between those two ends of the spectrum. You have to consider what is going to be the most high yield in each class as well. In some classes you receive a large percentage of your grade from presentations and other busywork, but in a lot of classes it strictly exams. I don't sweat the exams as much in presentation-based classes obviously, but I feel like sometimes a lot of my classmates study and stress over quizzes that are worth 5% of a class as much as they do over exams that are worth 40%. Developing the ability to guess what will be high-yield for each professor with a good degree of accuracy, both on the course scale and on the individual lecture scale, will help you greatly.
In my program we have to take all of our exams on iPads, so consequently everyone has an iPad in class all the time. A couple people prefer laptops, but downloading powerpoints into an app like Notability or PDF Expert and taking notes using an iPad with a bluetooth keyboard seems to work great for most people. I personally love it and am glad my program has mandatory iPads or I probably never would have bought one. All the tests are taken electronically (no more stupid Scantrons, hallelujah!) so you get your results instantly when you finish, I can draw diagrams, labels, etc. on the powerpoints and then type notes in the blank spaces quite efficiently during lectures, battery life is much better than a laptop so I can go back and forth between class and library all day without worrying about plugging in, everything backs up automatically to Google Drive so I can access lectures on my phone when I'm on the go if necessary, or on my computer when I'm at home, and my flashcard making app and several other helpful school related apps are right there on the tablet too. Most of the same things can be accomplished with a laptop, and some people just prefer paper notes, but for me the tablet + keyboard approach has turned out to be the most convenient, portable and efficient option. Not saying you should rush out to Best Buy today, but I think it's something more students should look into that I wish I had thought about sooner.