I'd like to echo what shredder said regarding efficient studying - smart study is key. There are a couple salient points to keep in mind for efficient studying:
- Find your best studying method. If visual, manage your studying through the use of diagrams. Flow diagrams / "concept diagrams" are wonderful studying tools. For an example of this, check out Lippincott's Illustrated Biochem; at the end of each chapter there is a concept map. Try to make your own. Or make your own flashcards. If you learn well by audio means, listen to lectures or talk to your peers about the material
- Break down your studying into smaller, manageable chunks. Do not attempt to tackle a large topic in one sitting. Study for an hour, get up, walk around for a bit, consolidate what you just read. If you go on for hours on end, you'll tire and lose focus, and invariably you will waste time.
- High-yield studying is key. That mountain of info is mostly fluff, and while you will be expected to remember details, certain details are more critical than others, and definitely large-scale concepts are important. What's important and what's not? Well, that's the biggest challenge as a med student. It's just something you have to figure out over time. Pay attention to what lecturers tend to stress, and keep in mind the learning objectives for your lectures.
- Repetition is invaluable. Read your notes over and over. Highlight them, annotate, summarize - do whatever it is you do - and read it all again a day later. Repetition could also be achieved by reading the material in multiple formats - supplement your notes with readings. Review books are useful for this purpose.
- USE PRACTICE QUESTIONS! This is my favorite way to study. It's a change of pace from "okay, read this, write that, memorize memorize memorize". Practice questions are all about applying what you've learned, and seeing if you learned it. Use old exams if they are available and ethically allowed. If not, there's tons of other resources to turn to for practice questions. It's important not just to figure out the right answers, but also look and see why the wrong answers are wrong (and what makes them tempting as distractors).
Well, I hope that helps you a little bit, and don't worry, a lot of people struggle at this stage in their career... have confidence in yourself and you can make the needed adjustments to succeed in medical school. Good luck.