In my experience:
1. It takes time getting used to reading at this level, there isn't much you can do to speed it up other than keep at it. You will find next year you'll be a fait bit faster
2. You may never get through all of it, I rarely do but you start to learn how to decide which is vital and which is a luxury.
3. Make a list, prioritise and check it off it helps you get a handle of how much, when its due and helps you feel a sense of accomplishment when you get through some.
4. Come in before/stay back after class and do the reading then, less procrastination if you are stuck in the library
Good luck