Is this your first year? I promise you it DOES get easier, the workload and probably being back off a long summer does just take some getting to used to. By the end of the first term when I could keep up on top of it all I finally began to mean understand whye veryone found university easy.
Set up a schedule and stick to it. You don't need to read every book on the reading list (unless you are specifically asked to) try and break it down using the contents and indexes to find out what you actually need to read. Make sure you meet with the people for your group work frequently. Try and schedules all the dates you are going meet in advance instead of just after each session, I personally find that alot more manageable.
It's important to take time off for yourself too, don't feel guilty relaxing on a friday night or taking your birthday off, especially if it's during reading week