sounds like you're at an elite medical school. Don't let that discourage you. Like many of the other posters, I studied 10-12 hours a day on top of 4 hours of lecture on my weekdays. I had to learn this incredibly quickly about 2 months into my first term. Everyone needs to find a method.
We had PPTs for every lecture- tests and USMLE were largely based off of these. Often, there weren't many concepts to wrap my head around (maybe a few in physiology) which is vastly different from college. Instead, you need to memorize staggering amounts of information, like drinking water through a fire hose. This requires less intelligence.
I would start studying every day after lecture like this: Read the first slide. Understand it, close my eyes, repeat it, and recheck the slide to see if I missed any details. Move on to slide 2. Do the same, but when I finish re-repeat slide 1 with my eyes closed and re-check it. SLide 3. Then repeat 1 and 2. and so forth. By the time I got to the end of the lecture (around 30 slides) I had it all committed to memory. I would then do the days next lectures this way.
When I finished this, I would then start from the lectures 2 days prior, but since I had spent 3 hours memorizing it 2 days ago and the day before repeating it, I would regurgitate the entire PPT and check what I missed in a grand total of 30 mins. then I would do this for the day priors of lectures. Then I would do every lecture from the week over saturday, and then the week before that on sunday. I always had every lecture memorized for the past 2 weeks. total study time per day: 10-12 hours a day, not including a run and a few breaks every 3-4 hours for 15 mins of chatting with other neurotic students.
It was a slow grind, yes. But the benefits of this method are a few: one, you make studying a competition with yourself. It feels so good when you are able to rattle off an entire lecture in 20 mins with all the details. Second, you are always up to date and do NOT have to cram before exams. You always feel in control. WHen everyone else is freaking out you can repeat every detail of every slide the day before the exam. So not only are you retaining tons of information most of your classmates are not, but you are also encouraging yourself and building confidence every single day. It feeds back on itself and you feel excellent about how you're doing, and this is certainly worth the time and effort you put in every day. Also, break up this with a 45-60 min run and dinner every day, it helps immensely.
Step 1 and 2: mid 250's. Graduated Summa. Currently- EM resident (but could have matched whatever I wanted)
Good luck and do not be discouraged. You're going to be a fantastic doctor, I would bet $$ on it.