Good habits are developed early in education, unfortunately mine collapsed first semester freshman year.
One good thing I found was a circle of friends within your major - always helpful for remembering projects, due dates, and a good source of lab partners worth anything. Missing class notes isn't a problem, and collaborating on homework can help you learn from each other. Also helps you relax when you see that other people are able to take the same pressure, or that someone is freaking out more than you.
I had to balance part-time job(s), engineering courseload, and a social life. It takes a lot to suceed in all of those - I could usually manage only 1 or 2. Something had to give, and for me it was organized events and clubs (never joined any) and working out (never once stepped foot in the greatest free gym I'll ever have access to).
Things I missed - not a supporter of my teams because I was too busy and they sucked. Never once went to a frat party at my own school (I was too busy and they sucked). Never took a crazy road trip(I only had a 2 seater). If there's a takeway, it's moderation in all things - the fun I missed out on as an undergrad, I had to cram into 3 years as a part-time student and full-time desk jockey.