Good day, Melissa92H
I've found tape recording lectures, and re-listening to the lecture every chance I get helpful. Read the material before and after class in sections; don't go onto the next section until you understand the section you've been reading. Ask questions in class, answer questions in class (even when you are wrong, you are finding out what is the right answer). Consider joining a small, organized study group (if not organized, drop ship fast on the study group), as DT70 shared, see a tutor.
Also, consider seeing your professor taking your notebook and book along showing how you take notes (do this as early on in the semester; after 1st class best), and ask them if they would change anything in terms of what notes you've taken.
Ask yourself why you do well in labs... is it because it's hands on? If yes, then find a hands on way for lecture. You can do it.