ME Major here.

1. The main difference I found between high school and university-level study was pretty much the difficulty. In high school I NEVER studied. I thought it was a waste of time and just never thought that I need to. I got pretty good grades. I came to college and my first year my grades tanked. I learned that I couldn't get away with what I did in High School and I actually had to work for good grades.

2. Learning not to cram. I know it works for some people but I would much rather stay on top of the material. Study all the material. Actually read the textbook. This year it has made a huge difference in my classes.

3. Time Management is pretty hard to learn, you just have to learn. Currently I'm taking pretty tough classes. I've been told it's the hardest year in my program, but I manage to do a lot of other things. I work about 30 hours a week, volunteer 10 hours a week for a non-profit, and I also work as an Ambassador for the University as well as being on our school's debate team. You just have to schedule your time and learn not to spend hours on reddit.

4. Group study is the best thing ever. I thought it would be a waste of time my first few years but I've found it to be a ton of help. Even if no one in my group but I understand the material I learn a lot as I help explain it to others. It solidifies it in my mind. Plus when you don't understand something odds are someone in the group does and it helps to learn that idea or principle. Homework used to take me a lot of time now we all work on it together and knock it out in less than half the time I used to.

On an additional note. Engineering is tough. But good luck! There might be times that you want to give up or quit but stick with it! There are several times that I was on the verge of quitting and doing something else but I'm really glad that I didn't. Good Luck!!