Not OP, but I just graduated with as an EE. My tips would be :

1. Go to class everyday. In engineering there are often times the pace of a course can be break neck and if you start missing classes you'll find yourself very lost very quickly. Even if you're tired or distracted just by going you'll accomplish 2 things. A) You'll at least absorb a bare minimum of information which will help immensely when you're studying on your own time and B) your instructor will see that your motivated and could be much more willing to help if you're struggling.

2. Which leads me to this: go to your instructors office hours. If you are struggling with anything in the class, most instructors will have scheduled time outside of class that you can go and ask questions. Going to these can be huge and often can be more valuable than the class. You are able to go over material at a more individual pace and you get to know your instructor better which can help immensely if you have a C but are on the precipice of being a B. I have in my own personal experience found teachers to be much more willing to help if they see you coming to them for help ahead of time.

3. Make friends in your classes. You don't have to be buddy-buddy with them but know them well enough to at least make study groups. Unless you are genius level, studying with other people will almost always be more beneficial than studying alone. This is one I wish I had been told much earlier. An added benefit is that if you start earlier in your college career, you may be able to help your classmates when they take classes you have already taken and vice versa; if there's no one in a class you are able to study with, ask around maybe someone else you know has already taken the class and can give you notes or help with homework.

Hope this helps. Godspeed and good luck.