18 credit hours next semester, any words of wisdom for me?

Some courses at my university are only offered in the spring so my academic adviser has recommended that I take these if I intend to stay on track:

1. Intro to Hardware
2. Computability and Automata
3. Networks and Distributed Processing
4. Calculus I
5. Systems Software  

Winter break is roughly a month, is there anything I should do to prepare? Maybe a heads-up on what to expect (other than being deprived of sleep and a social life!) or how to prioritize my time with this schedule according to the difficulty of each.. Thanks!